C++ Example – Check for Prime Number |

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C++ Example - Check for Prime Number

C++ Example

A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Example

#include<iostream>
using namespace std;

int main()
{
    int n, i;
    bool isPrime = true;

    cout << "Enter a positive integer: ";
    cin >> n;

    for(i = 2; i <= n / 2; ++i)
    {
        if(n % i == 0)
        {
            isPrime = false;
            break;
        }
    }

    if(isPrime)
        cout << "is a prime number";
    else
        cout << "is not a prime number";

    return 0;
}

The output of the above program is:

Enter a positive integer: 29
is a prime number

C++ Example