#include <stdio.h>

struct money
{
    char *repr;
    int value;
    int num;
};


void
change(int cost, int tendered, struct money *avail, int num)
{
    struct money *iter = avail;
    int change = tendered - cost;

    for (int i = 0; i < num; i++, iter++)
    {
        iter->num = change / iter->value;
        change -= iter->num * iter->value;
    }

    printf("%10s: %3d.%02d\n", "Cost", cost / 100, cost % 100);
    printf("%10s: %3d.%02d\n", "Tendered", tendered / 100, tendered % 100);
    printf("-----------------\n");

    iter = avail;
    for (int i = 0; i < num; i++, avail++)
        printf("%10s: %d\n", avail->repr, avail->num);
}


int
main(void)
{
    struct money mon[] = {
        { "Twenty", 2000, 0 },
        { "Ten", 1000, 0 },
        { "Five", 500, 0 },
        { "One", 100, 0 },
        { "Quarter", 25, 0 },
        { "Dime", 10, 0 },
        { "Nickel", 5, 0 },
        { "Penny", 1, 0 },
    };
    change(2117, 10000, mon, sizeof(mon) / sizeof(struct money));
}