CS50 2024 - Week 1 - Cash

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

// This problem set is so much more confusing when you're not American
// or British and can't remember what quarters/nickels/dimes/pennies are...

// --------------------
// ---- PROTOTYPES ----
// --------------------

int get_change(void);
int quarters_calc(int change);
int nickels_calc(int change);
int dimes_calc(int change);
int pennies_calc(int change);

// -----------------------
// ---- MAIN FUNCTION ----
// -----------------------

int main(void)
{
    int change = get_change();

    int quarters = quarters_calc(change);
    change = change - quarters * 25;

    int dimes = dimes_calc(change);
    change = change - dimes * 10;

    int nickels = nickels_calc(change);
    change = change - nickels * 5;

    int pennies = pennies_calc(change);
    change = change - pennies;

    int coins = quarters + nickels + dimes + pennies;

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

// --------------------------
// ---- CUSTOM FUNCTIONS ----
// --------------------------

// Asks the user how much change he needs
int get_change(void)
{
    int change;
    do
    {
        change = get_int("Change owed: ");
    }
    while (change < 0);
    return change;
}

// Calculates the number of quarters (25c) needed
int quarters_calc(int change)
{
    int quarters = 0;
    while (change >= 25)
    {
        change = change - 25;
        quarters++;
    }
    return quarters;
}

// Calculates the number of dimes (10c) needed
int dimes_calc(int change)
{
    int dimes = 0;
    while (change >= 10)
    {
        change = change - 10;
        dimes++;
    }
    return dimes;
}

// Calculates the number of nickels (5c) needed
int nickels_calc(int change)
{
    int nickels = 0;
    while (change >= 5)
    {
        change = change - 5;
        nickels++;
    }
    return nickels;
}

// Calculates the number of pennies (1c) needed
int pennies_calc(int change)
{
    int pennies = 0;
    while (change >= 1)
    {
        change = change - 1;
        pennies++;
    }
    return pennies;
}