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

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

#include<stdio.h>

void check(int n, int *p) {
    int i;
    for (i = 2; i < n; i++) {
        if (n % i == 0) {
            *p = 0;
        }
    }
}

int main() {

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

    check(n, &p);

    if (p == 1) {
        printf("Number is prime:%d", n);
    } else {
        printf("Number is not prime:%d", n);
    }

    return 0;
}

Output:

Enter a number:17                                                                                                                      
Number is prime:17