basic-c/sources/prime.c

#include<stdio.h>

int main(int argc, char *argv[]) {
    int number;
    int dividers = 0, i = 1;
    printf("Enter number: ");
    scanf("%d", &number);
    while (i <= number) {
        if (number % i++ == 0) {
            dividers++;
        } else {
            continue;
        }
        if (dividers == 3) 
            break;
    }
    printf("Number %d is%s prime", 
            number, 
            (dividers == 2) ? "" : " not"
          );
}