7th assignment

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

int     main(int argc, char **argv)
{
    unsigned long   wire_length;
    unsigned int    cnt;
    int             number;
    int             distance;

    if (argc != 3) {
        printf("Usage: %s number distance\n", argv[0]);
        return 0;
    }

    wire_length = 0;
    number = atoi(argv[1]);
    distance = atoi(argv[2]);

    /*  asymptotic complexity of algorithm is O(n)  */
    for (cnt = 1; cnt <= number; cnt++)
        wire_length += cnt * distance;

    printf("%lu\n", wire_length);

    return 0;
}