Check for Prime Number in C

This program checks if a given number is prime.

#include <stdio.h>

#include <stdbool.h>

 int main() {

    int n, i;

    bool isPrime = true;

    printf("Enter a positive integer: ");

    scanf("%d", &n);

    if (n == 0 || n == 1) {

        isPrime = false;

    } else {

        for (i = 2; i <= n / 2; ++i) {

            if (n % i == 0) {

                isPrime = false;

                break;

            }

        }

    }

    if (isPrime)

        printf("%d is a prime number.\n", n);

    else

        printf("%d is not a prime number.\n", n);

    return 0;

}