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<iostream>
using namespace std;

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;
    cout << "Enter a number:";
    cin>>n;

    check(n, &p);

    if (p == 1) {
        cout << "Number is prime:" << n;
    } else {
        cout << "Number is not prime:" << n;
    }

    return 0;
}

Output:

Enter a number:13
Number is prime:13