Write a C program to check whether a string is a palindrome

Description: Take a word as input. Print if it is a palindrome, like “madam” or “level”.

Hint:

• Compare the first character with the last, the second with the second last, and so on.

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C program to check a palindrome string

#include <stdio.h>
#include <string.h>

int main(void) {
    char s[50];
    int isPalindrome = 1;

    printf("Enter a word: ");
    scanf("%49s", s);

    int n = strlen(s);
    for (int i = 0; i < n / 2; i++) {
        if (s[i] != s[n - 1 - i]) {
            isPalindrome = 0;
            break;
        }
    }

    if (isPalindrome) {
        printf("%s is a palindrome\n", s);
    } else {
        printf("%s is not a palindrome\n", s);
    }
    return 0;
}

Output:

How it works

• We only need to check half of the string (n / 2 pairs).
• One mismatch is enough to say it is not a palindrome, so we stop with break.

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