C Program to check number is a palindrome or not using call by reference

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In this program, You will learn how to check number is a palindrome or not using call by reference in c.

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Call by Reference

void check(int n, int *p) { 
   statement
}

Example: How to check number is a palindrome or not using call by reference in c.

#include<stdio.h>

void check(int n, int *p) {

    int r, rev = 0;
    while (n > 0) {
        r = n % 10;
        rev = rev * 10 + r;
        n = n / 10;
    }
    *p = rev;
}

int main() {

    int n, p = 0;

    printf("Enter a number:");
    scanf("%d", &n);

    check(n, &p);
    if (p == n) {
        printf("Number is palindrome:%d", n);
    } else {
        printf("Number is not palindrome:%d", n);
    }

    return 0;
}

Output:

Enter a number:121                                                                                                                     
Number is palindrome:121