Write a C program using user-defined functions to determine whether the given string is palindrome or not

In this article, we will write a C program using user-defined functions to determine whether the given string is palindrome or not.

Palindrome means the string on reversal should be the same as the original.

Example: madam on reversal is also madam

Algorithm: 

Step 1: start 

Step 2: read a string A 

Step 3: copy string A into B 

Step 4: reverse string B 

Step 5: compare A &B If A equals B to got step 6 Else goto step 7 

Step 6:print given string A is palindrome Step 7:print g

Write a C program using user-defined functions to determine whether the given string is palindrome or not

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

void main()
{
	char string[25], reverse_string[25] = { '\0' };
	int i, length = 0, flag = 0;

	printf("Enter a string \n");
	gets(string);
	for (i = 0; string[i] != '\0'; i++)
	{
		length++;
	}
	printf("The length of the string '%s' = %d\n", string, length);
	for (i = length - 1; i >= 0; i--)
	{
		reverse_string[length - i - 1] = string[i];
	}
	for (flag = 1, i = 0; i < length; i++)
	{
		if (reverse_string[i] != string[i])
			flag = 0;
	}
	if (flag == 1)
		printf("%s is a palindrome \n", string);
	else
		printf("%s is not a palindrome \n", string);
}

Input:

Enter a string
 madam

Output:

The length of the string 'madam' = 5
madam is a palindrome 

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