assignment-p-13.c

Metadata

• Author — Amit Dutta
• Last updated — 12 Dec 2025
• License — MIT License (See the LICENSE file for details)

Problem Statement

Problem Statement

Write a C program that accepts a string as a command line argument and includes a user- defined function named isPalindrome with the signature int isPalindrome(char str[]);. The function should check if the given string is a palindrome and return 1 if it is, and 0 otherwise.

Source Code

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

int isPalindrome(char[]);

int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        printf("\nUsage: %s <string>\n", argv[0]);
        return 1;
    }
    if (isPalindrome(argv[1]))
    {
        printf("\nThe entered string \"%s\" is Palindrome.\n", argv[1]);
    }
    else
    {
        printf("\nThe entered string \"%s\" is not Palindrome.\n", argv[1]);
    }
    return 0;
}

int isPalindrome(char str[])
{
    char *start = str;
    char *end;
    int len = strlen(str);
    if (len == 0)
    {
        return 1;
    }
    end = str + (len - 1);
    while (start < end)
    {
        if (*start != *end)
        {
            return 0;
        }
        start++;
        end--;
    }
    return 1;
}