C Program to Check String is Palindrome using Stack

/*
 * C Program to Check String is Palindrome using Stack.
 */
#include <stdio.h>
#include <string.h>

void push(char);
char pop();

char stack[100];
int top = -1;

void main()
{
    char str[100];
    int i, count = 0, len;

    printf("Enter string to check it is palindrome or not : ");
    scanf("%s", str);

    len = strlen(str);

    for (i = 0; i < len; i++)
    {
        push(str[i]);
    }

    for (i = 0; i < len; i++)
    {
        if (str[i] == pop())
            count++;
    }

    if (count == len)
        printf("%s is a Palindrome string\n", str);
    else
        printf("%s is not a palindrome string\n", str);
}

/* Function to push character into stack */
void push(char c)
{
    stack[++top] = c;
}

/* Function to pop the top character from stack */
char pop()
{
    return(stack[top--]);
}

OUTPUT

Enter string to check it is palindrome or not : madam
madam is a Palindrome string

Enter string to check it is palindrome or not : depfoundry
depfoundry is not a palindrome string