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

float getChange();
int getQuarter(int);
int getDime(int);
int getNickel(int);

int main(void)
{
    float change = 0;
    int changeCent;
    int coin = 0;
    change = getChange();
    changeCent = round(change * 100);
    coin += getQuarter(changeCent);
    changeCent -= getQuarter(changeCent) * 25;
    coin += getDime(changeCent);
    changeCent -= getDime(changeCent) * 10;
    coin += getNickel(changeCent);
    changeCent -= getNickel(changeCent) * 5;
    coin += changeCent;

    printf("%i\n", coin);
}

float getChange()
{
    float change = -1;
    printf("O hai! How much change is owed?\n");
    change = GetFloat();
    while(change < 0){
        printf("How much change is owed?\n");
        change = GetFloat();
    }

    return change;
}

int getQuarter(int change)
{
    return change / 25;
}

int getDime(int change)
{
    return change / 10;
}

int getNickel(int change)
{
    return change / 5;
}