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Copy file name to clipboardExpand all lines: PROMPT.txt
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The target audience of this would be students from the Philippines who don't know how to read the error messages or does not know how to do debugging. They also have a short attention span so longer explanations do not work for them. This is learning by doing so make them understand and gradually do not rely on this tool.
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---
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The expected output should be a unit test case which consists of a sample test program and test template. The format should be like this (STICK TO THIS!):
gen.Add("One of your variables initialized a double value by dividing a number to zero")
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gen.Add("This error is raised when you try to perform arithmetic operations that are not mathematically possible, such as division by zero.")
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casenonTerminatingDecimal:
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gen.Add("TODO")
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gen.Add("This error is raised when dividing two `BigDecimal` numbers, and the division operation results in a non-terminating decimal expansion, meaning the division produces a non-repeating and non-terminating decimal.")
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caseunknown:
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gen.Add("Unknown ArithmeticException")
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gen.Add("You just encountered an unknown `ArithmeticException` error of which we cannot explain to you properly.")
gen.Add("Avoid dividing by zero.", func(s*lib.BugFixSuggestion) {
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s.AddStep("To fix the 'ArithmeticException: / by zero', you need to ensure you are not dividing by zero, which is mathematically undefined.").
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AddFix(lib.SuggestedFix{
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NewText: "1",
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Description: "This adjustment replaces the division by zero with a value that is not zero, ensuring the operation is valid. Division by zero is mathematically undefined, causing an 'ArithmeticException'. By changing the denominator to a non-zero value, you prevent the error.",
s.AddStep("Handle the ArithmeticException by wrapping the division operation in a try-catch block to manage the potential exception and inform the user about the non-terminating result.").
gen.Add("Your program attempted to access an element in index %s on an array that only has %s items", cd.Variables["index"], cd.Variables["length"])
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gen.Add("This error occurs because the code is trying to access index %s that is beyond the bounds of the array which only has %s items.", cd.Variables["index"], cd.Variables["length"])
// TODO: add a suggestion to add an if statement if the array length is 0
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gen.Add("Accessing Array Index Within Bounds", func(s*lib.BugFixSuggestion) {
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sampleIndex:=max(0, arrayLen-2)
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s.AddStep("The error is caused by trying to access an index that does not exist within the array. Instead of accessing index %s, which is beyond the array's length, change it to a valid index within the array bounds, for example, `nums[%d]`.", cd.Variables["index"], sampleIndex).
Description: "This adjustment ensures that you're accessing an index that exists within the array bounds, preventing the `ArrayIndexOutOfBoundsException`.",
Exception in thread "main" java.lang.ArithmeticException: / by zero
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at Arith.main(Arith.java:3)
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===
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template: "Java.ArithmeticException"
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---
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# ArithmeticException
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This error is raised when you try to perform arithmetic operations that are not mathematically possible, such as division by zero.
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```
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public static void main(String[] args) {
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double out = 3 / 0;
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^
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System.out.println(out);
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}
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}
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```
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## Steps to fix
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### Avoid dividing by zero.
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To fix the 'ArithmeticException: / by zero', you need to ensure you are not dividing by zero, which is mathematically undefined.
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```diff
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public class Arith {
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public static void main(String[] args) {
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- double out = 3 / 0;
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+ double out = 3 / 1;
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System.out.println(out);
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}
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```
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This adjustment replaces the division by zero with a value that is not zero, ensuring the operation is valid. Division by zero is mathematically undefined, causing an 'ArithmeticException'. By changing the denominator to a non-zero value, you prevent the error.
Exception in thread "main" java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
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at java.base/java.math.BigDecimal.divide(BigDecimal.java:1722)
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at ArithEx.main(ArithEx.java:7)
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===
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template: "Java.ArithmeticException"
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---
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# ArithmeticException
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This error is raised when dividing two `BigDecimal` numbers, and the division operation results in a non-terminating decimal expansion, meaning the division produces a non-repeating and non-terminating decimal.
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## Steps to fix
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### 1. Ensure precise division
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Adjust the division operation to ensure precision by specifying the scale and rounding mode for the `BigDecimal` division.
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```diff
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BigDecimal a = new BigDecimal(5);
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BigDecimal b = new BigDecimal(3);
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- BigDecimal result = a.divide(b);
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+ BigDecimal result = a.divide(b, 10, RoundingMode.HALF_UP);
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System.out.println(result);
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```
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### 2. Catch ArithmeticException
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Handle the ArithmeticException by wrapping the division operation in a try-catch block to manage the potential exception and inform the user about the non-terminating result.
This change introduces a try block to execute the division operation and catches any ArithmeticException that might occur, allowing you to manage the exception and inform the user about the non-terminating result.
Copy file name to clipboardExpand all lines: error_templates/java/test_files/array_index_out_of_bounds/test.txt
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template: "Java.ArrayIndexOutOfBoundsException"
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---
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# ArrayIndexOutOfBoundsException
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This error occurs because the program is attempting to access an element in an array at an index that does not exist.
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## Steps to fix
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1. **Understanding the issue:** The error is due to the attempt to access the element at index 5 in an array that has a length of 4. Array indices start from 0, so in an array of length 4, the valid indices are from 0 to 3.
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```diff
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- System.out.println(nums[5]);
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+ // Accessing an index beyond the array length causes the ArrayIndexOutOfBoundsException.
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This error occurs because the code is trying to access index 5 that is beyond the bounds of the array which only has 4 items.
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```
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## Steps to fix (Alternative)
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1. **Avoid accessing out-of-bounds index:** To fix this, ensure that the index used to access the array elements is within the bounds of the array (0 to array length - 1).
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int nums[] = {1,2,3,4};
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System.out.println(nums[5]);
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^
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}
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}
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```
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## Steps to fix
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### Accessing Array Index Within Bounds
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The error is caused by trying to access an index that does not exist within the array. Instead of accessing index 5, which is beyond the array's length, change it to a valid index within the array bounds, for example, `nums[2]`.
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```diff
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public static void main(String[] args) {
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int nums[] = {1,2,3,4};
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- System.out.println(nums[5]);
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+ // Ensure the index is within the array bounds.
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}
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public static void main(String[] args) {
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int nums[] = {1,2,3,4};
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- System.out.println(nums[5]);
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+ System.out.println(nums[2]);
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}
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}
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```
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Remember, in Java arrays, indices start from 0, and the last index is always length - 1. Accessing an index beyond the array's length leads to an `ArrayIndexOutOfBoundsException`.
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This adjustment ensures that you're accessing an index that exists within the array bounds, preventing the `ArrayIndexOutOfBoundsException`.
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