C Program to check if a given string is palindrome or not

In this post we’re going to implement a C program to check A given string is a palindrome or not.

A string is said to be palindrome if reverse of the string is same as string.

For example, “abba” is palindrome, but “abbc” is not palindrome.

Steps to solve this problem

1. Find the length of the string using the function len(str). Assume it as n.
2. Initialize low and high as 0 and n-1 respectively.
3. Check if str[low] and str[high] are same. if not return false
4. increase low by 1 and decrease high by 1.
5. Repeat step 3 and 4 until low>high.
6. if we reach step 5 that means we’ve got all str[low] and str[high] same.

Below is the C implementation to check if a given string is palindrome or not.

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

// A function to check if a string str is palindrome
// Driver program to test above function
int main()
{
void isPalindrome(char str[])
{
	// Start from leftmost and rightmost corners of str
	int l = 0;
	int h = strlen(str) - 1;

	// Keep comparing characters while they are same
	while (h > l)
	{
		if (str[l++] != str[h--])
		{
			printf("%s is not a palindrome\n", str);
			return;
		}
	}
	printf("%s is a palindrome\n", str);
}


	isPalindrome("abba");
	isPalindrome("abbccbba");
	isPalindrome("geekycodes");
	return 0;
}

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