Create Palindrome String Problem of IB in CPP

Palindrome String Problem of IB in CPP

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+Problem Statement : 
+
+    Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
+
+    Example:
+
+    "A man, a plan, a canal: Panama" is a palindrome.
+
+    "race a car" is not a palindrome.
+
+    Return 0 / 1 ( 0 for false, 1 for true ) for this problem
+
+
+
+Solution :
+
+
+int Solution::isPalindrome(string A) {
+    int i = 0, j = A.length();
+
+    for(int a = 0; a < j; a++){
+        A[a] = (char) tolower(A[a]);
+    }
+
+    while(i < j){
+        if((A[i] >= 'a' && A[i] <= 'z') || (A[i] >= '0' && A[i] <= '9')){ 
+            if((A[j] >= 'a' && A[j] <= 'z') || (A[j] >= '0' && A[j] <= '9')){
+                if(A[i] == A[j]){
+                    i++;
+                    j--;
+                }
+                else return 0;
+            }
+            else{
+                j--;
+            }
+        }
+        else{
+            i++;
+        }
+    }
+
+    return 1;
+}