C Random Number Generator

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void printArray(int * a, int size) {
    for (int i=0; i<size; i++) {
        printf("%d", a[i]);
        if (i==size-1) putchar('\n');
        else printf(", ");
    }
}
int product (const int * v1, const int * v2, unsigned int size) {
    int result=0;
    for (unsigned i=0; i<size; i++) {
        result = result + v1[i]*v2[i];
    }
    return result;
}
int main(int argc, char * argv[])
{
    srand(time(NULL));
    int size=2;
    if (argc>1) {
        int a=atoi(argv[1]);
        if (a>0) size=a;
    }
    int * array1, * array2;

    int status;
    do {
        array1=malloc(size * sizeof(int));
        array2=malloc(size * sizeof(int));
        if (array1 == NULL || array2==NULL) {
            fputs("Memory allocation error!", stderr);
            return EXIT_FAILURE;
        }
        for (int i=0; i<size; i++) {
            array1[i] = rand() % 200 - 100;
            array2[i] = rand() % 200 - 100;
        }
        //printArray(array1, size);
        //printArray(array2, size);
        printf("Scalar product= %d\n", product(array1, array2, size));
        puts("Let's try again - enter a new size!");
        status = scanf("%d", &size);
        free(array1);
        free(array2);
    } while (status>0);
    return 0;
}