PG0004.Question01

[jack81722]

Introduction

同上次的題目，這次新增了自訂運算子的練習，下載後實作下列方法

public struct Vector2
{
    public static Vector2 operator +(Vector2 v1, Vector2 v2);
    public static Vector2 operator -(Vector2 v1, Vector2 v2);
    public static Vector2 operator *(Vector2 v1, float f);
    public static Vector2 operator /(Vector2 v1, float f);

    public static implicit operator Vector2(Vector3 v);
    public static explicit operator Vector3(Vector2 v);

    public override string ToString();	// 以(x, y, z)的格式回傳 
}

Answer

答案

主要就練習寫operator overloading，寫到這裡其實你已經把UnityEngine的Vector2實作做得差不多了！

public struct Vector2
{
    const float kEpsilon = 1E-05f;
    public float x, y;

    #region -- Constructor --
    public Vector2(float x, float y)
    {
        this.x = x; this.y = y;
    }
    #endregion

    #region -- Operators --
    /// <summary>
    /// Plus two vector
    /// </summary>
    public static Vector2 operator +(Vector2 v1, Vector2 v2)
    {
        return new Vector2(v1.x + v2.x, v1.y + v2.y);
    }

    /// <summary>
    /// Subtract two vector
    /// </summary>
    public static Vector2 operator -(Vector2 v1, Vector2 v2)
    {
        return new Vector2(v1.x - v2.x, v1.y - v2.y);
    }

    /// <summary>
    /// Multiple vector by float 
    /// </summary>
    public static Vector2 operator *(Vector2 v, float f)
    {
        return new Vector2(v.x * f, v.y * f);
    }

    /// <summary>
    /// Divide vector by float
    /// </summary>
    /// <returns></returns>
    /// <exception cref="ArgumentException">f is zero</exception>
    public static Vector2 operator /(Vector2 v, float f)
    {
        if (Math.Abs(f) < kEpsilon)
        {
            throw new ArgumentException("The absolute f must be greater than 1E-05f");
        }
        return new Vector2(v.x / f, v.y / f);
    }
    #endregion

    #region -- Conversion --
    /// <summary>
    /// Convert Vector3 to Vector2
    /// </summary>
    public static implicit operator Vector2(Vector3 v)
    {
        return new Vector2(v.x, v.y);
    }

    /// <summary>
    /// Convert Vector2 to Vector3
    /// </summary>
    /// <param name="v"></param>
    public static explicit operator Vector3(Vector2 v)
    {
        return new Vector3(v.x, v.y, 0);
    }
    #endregion

    /// <summary>
    /// Custom my-format string
    /// </summary>
    public override string ToString()
    {
        return $"({x}, {y})";
    }
}

[SoonYu97]

小鲨 (程式)

答案

public class Question1
{
    public struct Vector3
    {
        public float x; public float y; public float z;

        public Vector3(float x, float y, float z)
        {
            this.x = x; this.y = y; this.z = z;
        }
    }

    public struct Vector2
    {
        const float kEpsilon = 1E-05f;
        public float x, y;

        #region -- Constructor --
        public Vector2(float x, float y)
        {
            this.x = x; this.y = y;
        }
        #endregion

        #region -- Operators --
        /// <summary>
        /// Plus two vector
        /// </summary>
        public static Vector2 operator +(Vector2 v1, Vector2 v2)
        {
            return new Vector2(v1.x + v2.x, v1.y + v2.y);
        }

        /// <summary>
        /// Subtract two vector
        /// </summary>
        public static Vector2 operator -(Vector2 v1, Vector2 v2)
        {
            return new Vector2(v1.x - v2.x, v1.y - v2.y);
        }

        /// <summary>
        /// Multiple vector by float 
        /// </summary>
        public static Vector2 operator *(Vector2 v, float f)
        {
            return new Vector2(v.x * f, v.y * f);
        }

        /// <summary>
        /// Divide vector by float
        /// </summary>
        /// <returns></returns>
        /// <exception cref="ArgumentException">f is zero</exception>
        public static Vector2 operator /(Vector2 v, float f)
        {
            if (f == 0)
            {
                throw new ArgumentException("f is zero");
            }
            return new Vector2(v.x / f, v.y / f);
        }
        #endregion

        #region -- Conversion --
        /// <summary>
        /// Convert Vector3 to Vector2
        /// </summary>
        public static implicit operator Vector2(Vector3 v)
        {
            return new Vector2(v.x, v.y);
        }

        /// <summary>
        /// Convert Vector2 to Vector3
        /// </summary>
        /// <param name="v"></param>
        public static explicit operator Vector3(Vector2 v)
        {
            return new Vector3(v.x, v.y, 0);
        }
        #endregion

        /// <summary>
        /// Custom my-format string
        /// </summary>
        public override string ToString()
        {
            return $"({x}, {y})";
        }
    }
}

[A24575255]

JIA（程式新手）

我的答案

#region -- Operators --
public static Vector2 operator +(Vector2 v1, Vector2 v2)
{
    return new Vector2(v1.x + v2.x, v1.y + v2.y);
}
public static Vector2 operator -(Vector2 v1, Vector2 v2)
{
    return new Vector2(v1.x - v2.x, v1.y - v2.y);
}
public static Vector2 operator *(Vector2 v, float f)
{
    return new Vector2(v.x * f, v.y * f);
}
public static Vector2 operator /(Vector2 v, float f)
{
    if (Math.Abs(f) < kEpsilon) throw new ArgumentException("f equal zero");
    return new Vector2(v.x / f, v.y / f);
}
#endregion

#region -- Conversion --
public static implicit operator Vector2(Vector3 v)
{
    return new Vector2(v.x, v.y);
}
public static explicit operator Vector3(Vector2 v)
{
    return new Vector3(v.x, v.y, 0);
}
#endregion

public override string ToString()
{
    return $"({x}, {y})";
}

[OLDShaw1022]

老蕭OLDShaw（程式）

我的答案

public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (f == 0) throw new ArgumentException();

                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                Vector3 convertedResult = (Vector3)this;
                return $"({convertedResult.x}, {convertedResult.y}, {convertedResult.z})";
            }
        }
    }

測試截圖

因為平常沒在用Exception，雖然知道是用來手動丟錯誤的，但不知道除法Function前面那幾行是要做什麼，之後寫完進行測試想說0的除法的怎麼過不了，才想到除以0的值是不存在，Function傳0會出問題，後來猜說要自己丟Exception，後面才成功過測試。
這題如果數學基礎不好，又不知道Exception，應該會不知道要怎樣過測試吧？

[jack81722]

你說得對
我不小心把我自己寫的throw exception砍了
之後會補上，感謝提醒

[louise-bwsx]

小4 ( 程式 )

            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }

            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                v1.x += v2.x;
                v1.y += v2.y;
                return v1;
            }

            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                v1.x -= v2.x;
                v1.y -= v2.y;
                return v1;
            }

            public static Vector2 operator *(Vector2 v, float f)
            {
                v.x *= f;
                v.y *= f;
                return v;
            }

            public static Vector2 operator /(Vector2 v, float f)
            {
                if (f == 0)
                {
                    throw new ArgumentException();
                }
                v.x /= f;
                v.y /= f;
                return v;
            }

            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }

            //(1.00, 2.00)
            public override string ToString()
            {
                return $"({x}, {y})";
            }

TestImplicit TestExplicit ToString是不是忘了加[TestCase]
沒關係我自己++

[jack81722]

@tommyboys0107 大哥你是不是貼錯地方了ＸＤ

[jack81722]

對，我忘記加了= =

[angus945]

答案

 public static Vector2 operator +(Vector2 v1, Vector2 v2)
{
    return new Vector2(v1.x + v2.x, v1.y + v2.y);
}
public static Vector2 operator -(Vector2 v1, Vector2 v2)
{
    return new Vector2(v1.x - v2.x, v1.y - v2.y);
}
public static Vector2 operator *(Vector2 v, float f)
{
    return new Vector2(v.x * f, v.y * f);
}
public static Vector2 operator /(Vector2 v, float f)
{
    if(f == 0)
    {
        throw new ArgumentException();
    }
    else
    {
        return new Vector2(v.x / f, v.y / f);
    }
}
  public static implicit operator Vector2(Vector3 v)
  {
      return new Vector2(v.x, v.y);
  }
  public static explicit operator Vector3(Vector2 v)
  {
      return new Vector3(v.x, v.y, 0);
  }

  public override string ToString()
  {
      return $"({x}, {y})";
  }

[tommyboys0107]

Cliff Lee CL (程式、專案管理)

我的答案

public class Question1
{
    public struct Vector3
    {
        public float x; public float y; public float z;

        public Vector3(float x, float y, float z)
        {
            this.x = x; this.y = y; this.z = z;
        }
    }

    public struct Vector2
    {
        const float kEpsilon = 1E-05f;
        public float x, y;

        #region -- Constructor --
        public Vector2(float x, float y)
        {
            this.x = x; this.y = y;
        }
        #endregion

        #region -- Operators --
        /// <summary>
        /// Plus two vector
        /// </summary>
        public static Vector2 operator +(Vector2 v1, Vector2 v2)
        {
            return new Vector2(v1.x + v2.x, v1.y + v2.y);
        }

        /// <summary>
        /// Subtract two vector
        /// </summary>
        public static Vector2 operator -(Vector2 v1, Vector2 v2)
        {
            return new Vector2(v1.x - v2.x, v1.y - v2.y);
        }

        /// <summary>
        /// Multiple vector by float 
        /// </summary>
        public static Vector2 operator *(Vector2 v, float f)
        {
            return new Vector2(v.x * f, v.y * f);
        }

        /// <summary>
        /// Divide vector by float
        /// </summary>
        /// <returns></returns>
        /// <exception cref="ArgumentException">f is zero</exception>
        public static Vector2 operator /(Vector2 v, float f)
        {
            if (f == 0)
                throw new ArgumentException("f is zero");
            return new Vector2(v.x / f, v.y / f);
        }
        #endregion

        #region -- Conversion --
        /// <summary>
        /// Convert Vector3 to Vector2
        /// </summary>
        public static implicit operator Vector2(Vector3 v)
        {
            return new Vector2(v.x, v.y);
        }

        /// <summary>
        /// Convert Vector2 to Vector3
        /// </summary>
        /// <param name="v"></param>
        public static explicit operator Vector3(Vector2 v)
        {
            return new Vector3(v.x, v.y, 0);
        }
        #endregion

        /// <summary>
        /// Custom my-format string
        /// </summary>
        public override string ToString()
        {
            return $"({x}, {y})";
        }
    }
}

不小心貼錯地方重貼 (?

[jane901201]

Tina( Unity程式 | 佛系劇本 )

我的答案

using System;

namespace PG0004.Questions
{
    public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                } 
                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"{x}, {y}";
            }
        }
    }
}

[vre343434]

七七(程式)

我的答案

namespace PG0004.Questions
{
    public class Question1
    {
        public struct Vector3
        {
            public float x;
            public float y;
            public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x;
                this.y = y;
                this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x,
                y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x;
                this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                }
                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0f);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"({x},{y})";
            }
        }
    }
}

[YouSyuan]

Syuan

我的答案

public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                }
                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }
            #endregion

            public override string ToString()
            {
                return $"({x}, {y})";
            }
        }
    }

[BoLingCan]

罐頭（程式）

我的答案ヾ(•ω•`)o

namespace PG0004.Questions
{
    public class Question1
    {
        public struct Vector3
        {
            public float x;
            public float y;
            public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x;
                this.y = y;
                this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --

            public Vector2(float x, float y)
            {
                this.x = x;
                this.y = y;
            }

            #endregion

            #region -- Operators --

            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                }

                return new Vector2(v.x / f, v.y / f);
            }

            #endregion

            #region -- Conversion --

            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }

            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"({x},{y})";
            }
        }
    }
}

感覺上次的懂了後這次的順好多歐，超級有成就感~φ(゜▽゜*)♪

[jack81722]

(ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

[jefflin0424]

肥羊(程式)

我的答案

public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (f == 0) throw new ArgumentException("f is Zero"); //丟出報錯 訊息f is Zero

                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"{x}, {y}";
            }
        }
    }

[ISnoweve]

Snoweve (程式)

我的答案

    public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x*f,v.y*f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                } 
                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"({x}{y})";
            }
        }
    }
        

<<反饋>>
o7

[TWEdward]

TWEdward(新人/程式/企劃)

我的答案

public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                } 

                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x,v.y,0f);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return "(" + x + "," + y + ")";
            }
        }
    }

解題心得感想

謝謝老師的用心教學以及題目練習，我有感覺到有增加新的Know-how進來了，我的技能經驗值增加了，謝謝老師，讚^_^

[s32436515]

肉鬆（程式 / 音樂）

我的答案

　　public struct Vector2
        {
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                }
                return new Vector2(v.x / f, v.y / f);
            }

            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y, 0);
            }

            public override string ToString()
            {
                return $"({x},{y})";
            }
        }

課程回饋

override的$符號好酷喔xD
多寫幾個程式的含金量就高了

[jack81722]

我很常用這個語法
不然打string.Format也是可以
就是比較冗長

[dun047]

歐雷(程式)

答案

   public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y * f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");
                }
                return new Vector2(v.x / f, v.y / f);
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y,0);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"({x},{y})";
            }
        }
    }

[MurasakiAurora]

極光（程式）

我的答案

public class Question1
    {
        public struct Vector3
        {
            public float x; public float y; public float z;

            public Vector3(float x, float y, float z)
            {
                this.x = x; this.y = y; this.z = z;
            }
        }

        public struct Vector2
        {
            const float kEpsilon = 1E-05f;
            public float x, y;

            #region -- Constructor --
            public Vector2(float x, float y)
            {
                this.x = x; this.y = y;
            }
            #endregion

            #region -- Operators --
            /// <summary>
            /// Plus two vector
            /// </summary>
            public static Vector2 operator +(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x + v2.x, v1.y + v2.y);
            }

            /// <summary>
            /// Subtract two vector
            /// </summary>
            public static Vector2 operator -(Vector2 v1, Vector2 v2)
            {
                return new Vector2(v1.x - v2.x, v1.y - v2.y);
            }

            /// <summary>
            /// Multiple vector by float 
            /// </summary>
            public static Vector2 operator *(Vector2 v, float f)
            {
                return new Vector2(v.x * f, v.y *f);
            }

            /// <summary>
            /// Divide vector by float
            /// </summary>
            /// <returns></returns>
            /// <exception cref="ArgumentException">f is zero</exception>
            public static Vector2 operator /(Vector2 v, float f)
            {
                if (Math.Abs(f) < kEpsilon)
                {
                    throw new ArgumentException("The absolute f must be greater than 1E-05f");  

                }
                else
                {
                    return new Vector2(v.x / f, v.y / f);
                }
                
            }
            #endregion

            #region -- Conversion --
            /// <summary>
            /// Convert Vector3 to Vector2
            /// </summary>
            public static implicit operator Vector2(Vector3 v)
            {
                return new Vector2(v.x, v.y);
            }

            /// <summary>
            /// Convert Vector2 to Vector3
            /// </summary>
            /// <param name="v"></param>
            public static explicit operator Vector3(Vector2 v)
            {
                return new Vector3(v.x, v.y,0);
            }
            #endregion

            /// <summary>
            /// Custom my-format string
            /// </summary>
            public override string ToString()
            {
                return $"({x},{y})";
            }
        }
    }

在寫除法的時候不小心把 throw new ArgumentException 刪掉 讓我想了一陣子然後看題目報說答案是 ArgumentException
才把它改回去