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

int main (void)
{
    float dollars = 0;


    // get input, if not valid; retry
    do
    {
        printf("Amount of change (in $): ");
        dollars = GetFloat();

    if (dollars <= 0)
        {
            printf("Must be positive, try again.\n");
        }
    } while (dollars <= 0);

    // turn dollars into cents, make quarters, dime etc. into integers
    int cents = (int) (dollars * 100);
    double round(double cents);
    int q = 25;
    int d = 10;
    int n = 5;
    int p = 1;

    //variable for counting number of coins for change
    int coins = 0;

    // if cents bigger than 25 then subtract 25 and so forth
        if (cents > q)
        {
        cents = (cents - q);
        coins++;
        }

        else if (cents > d)
        {
        cents = (cents - d);
        coins++;
        }

        else if (cents > n)
        {
        cents = (cents - n);
        coins++;
        }

        else
        {
        cents = (cents - p);
        coins++;
        printf("Amount of coins back: %i\n", coins);
        }
}