C Program to check number is even or odd using call by reference

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In this program, You will learn how to check number is even or odd 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 even or odd using call by reference in c.

#include<stdio.h>

void check(int n, int *p) {

    if( n % 2 == 0){
        *p = 1;
    }else{
        *p = 0;
    }
}

int main() {

    int n, p = 1;
    printf("Enter a number:");
    scanf("%d", &n);

    check(n, &p);

    if (p == 1) {
        printf("Number is even:%d", n);
    } else {
        printf("Number is odd:%d", n);
    }

    return 0;
}

Output:

Enter a number:20                                                                                                                      
Number is even:20