CS50: cash

#include <stdio.h>
#include <cs50.h>
#include <math.h>

// quarters (25¢), dimes (10¢), nickels (5¢), and pennies (1¢)

int main(void)
{
    int quarter = 25;
    int dime = 10;
    int nickel = 5;
    int penny = 1;

    float dollars = 0;
    int coins = 0;
    do

    {
        dollars = get_float("Change owed:\n");
    }

    while (dollars < 0);
    // convert dollars to int to avoid imprecision
    int cents = round(dollars * 100);
    while (cents >= quarter)
    {
        cents = cents - quarter;
        coins++;
    }
    while (cents >= dime)
    {
        cents = cents - dime;
        coins++;
    }
    while (cents >= nickel)
    {
        cents = cents - nickel;
        coins++;
    }
    while (cents >= penny)
    {
        cents = cents - penny;
        coins++;
    }
    // return the number of coins needed
    printf("%i\n", coins);
    return 0;
}