prime.c

/*
 * prime.c
 *
 *  Created on: Oct 21, 2012
 *      Author: emma
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define abs(x) ((x < 0) ? x *= -1 : x)

int isPrime(int x);

int main(int argc, char **argv) {
    unsigned int temp;

    int x = atoi(argv[1]);

    x = abs(x);
    temp = isPrime(x);
    printf("Is %d prime: %d", x, temp);
    return 0;
}

int isPrime(int x) {
    if(x < 2)
        return 0;

    int temp = 1;
    int i;
    for(i = 2; i < x; i++) {
        if(x % i == 0)
            break;
        else temp = 0;
    }
    return temp;
}