diff --git a/Strings/ValidNumber.cpp b/Strings/ValidNumber.cpp
index 4d482c9..322dfc3 100644
--- a/Strings/ValidNumber.cpp
+++ b/Strings/ValidNumber.cpp
@@ -40,55 +40,29 @@ Yes for this problem
 https://www.interviewbit.com/problems/valid-number/
 */
 
-int Solution::isNumber(const string &A) {
+int Solution::isNumber(const string A) {
+
     int i = 0;
-    int n = A.length();
-    while (A[i]==' ') { ++i; }
-    if(i==n)
-        return 0;
-        
-    if ((A[i]=='-' || A[i]=='+') && ((A[i+1]>='0' && A[i+1]<='9') || A[i+1]=='.'))
-        i+=2;
-    else if (A[i]=='e')
-        return 0;
-    
-    bool eflag = false, dflag = false;
-    
-    while (i<n)
-    {
-        if(A[i]=='.')
-        {
-            if(eflag || dflag)
-                return 0;
-            else if(A[i+1]>='0' && A[i+1]<='9')
-                i+=2;
-            else
-                return 0;
-            dflag = true;
-        }
-        else if (A[i]=='e')
-        {
-            if(eflag)
-                return 0;
-            eflag = true;
-            if ((A[i+1]=='-' || A[i+1]=='+') && (A[i+2]>='0' && A[i+2]<='9'))
-                i+=3;
-            else if (A[i+1]>='0' && A[i+1]<='9')
-                i+=2;
-            else
+    int len = A.length();
+    int flag = 0;
+    while (A[i] == ' ' && i < len)
+        i++;
+
+    while (i < len) {
+        flag = 1;
+        if ((A[i] >= '0' && A[i] <= '9') || (A[i] == '.') || (A[i] == '-' && i == 0) || (A[i] == ' '))
+            i++;
+        else if (A[i] == 'e' && A[i - 1] != '.') {
+            i++;
+            while (A[i] != '.' && i < len)
+                i++;
+            if (i != len)
                 return 0;
-        }
-        else if (A[i]>='0' && A[i]<='9')
-            ++i;
-        else if (A[i]==' ')
-        {
-            ++i;
-            while (A[i]==' ') { ++i; }
-            if(i==n)
-                return 1;
-        }
-        else
+        } else
             return 0;
     }
-    return 1;
+
+    if (A[i - 1] != '.' && flag)
+        return 1;
+    return 0;
 }