📍📚Intermediate

Check Palindrome Using Pointers

Palindrome with pointers

A palindrome reads the same forwards and backwards. Using two pointers (start and end), we can efficiently check if a string is a palindrome.

📝 Examples

✓ "radar"

Is palindrome

✗ "hello"

Not palindrome

C Program to Check Palindrome Using Pointers

palindrome_pointers.c

1#include <stdio.h>
2#include <string.h>
3#include <stdbool.h>
4
5bool isPalindrome(char *str) {
6    char *start = str;
7    char *end = str + strlen(str) - 1;
8    
9    while (start < end) {
10        if (*start != *end) {
11            return false;
12        }
13        start++;  // Move forward
14        end--;    // Move backward
15    }
16    return true;
17}
18
19int main() {
20    char str1[] = "radar";
21    char str2[] = "hello";
22    
23    printf("\"%s\" is %s\n", str1, 
24           isPalindrome(str1) ? "a palindrome" : "NOT a palindrome");
25    printf("\"%s\" is %s\n", str2, 
26           isPalindrome(str2) ? "a palindrome" : "NOT a palindrome");
27    
28    return 0;
29}