Thread: C Program to convert a dollar amount

The program is supposed to convert a entered dollar amount into dollars, half dollars, quarters, dimes, nickels, and pennies. I have some of the program but I can't figure out the exact math. PLEASE HELP!!!!

Here's code I have:
insert

Code:

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


void convert(float amount);


void main(){
    //Do not change this function
    float amount;


    printf("Enter the amount: $");
    scanf("%f", &amount);
    convert(amount);
}


void convert(float amount){


    float dollar, hdollar,quarter, dime, nickel, penny;
    double hd = 0.50, q = 0.25, d = 0.10, n = 0.05, p = 0.01; 


    dollar = amount / 1.00;
    hdollar = (amount - (dollar * 1)); //% 50;
    quarter = (amount - ((dollar * 1) - (hdollar * 50))); // % 25;
    dime = (amount - ((dollar * 1) - (hdollar * 50) - (quarter * 25))); // % 10;
    nickel = (amount - ((dollar * 1) - (hdollar * 50) - (quarter * 25) - (dime * 10))); // % 5;
    penny = (amount - ((dollar * 1) - (hdollar * 50) - (quarter * 25) - (dime * 10) - (nickel * 5))); // % 1;
     


    printf ("Dollar Bills: %lf\n", dollar);
    printf ("hdollar: %lf\n", hdollar);
    printf ("Half Dollars: %lf\n", fmod(hdollar,hd));
    printf ("quarters: %lf\n", fmod(quarter,q));
    printf ("Dimes: %lf\n", fmod(dime,d));
    printf ("Nickle: %lf\n", fmod(nickel, n));
    printf ("Pennies: %lf\n", fmod(penny,p));


    
}

Here's an example of what it's supposed to do:
Enter the amount: $7.73
Dollar bills: 7
Half dollars: 1
Quarters: 0
Dimes: 2
Nickels: 0
Pennies: 3

Several ways to do it. I wouldn't overuse floating point maths. I much prefer integer maths for something like this. Amount has to be floating point, but do doubles seem sensible for number of dollars, half dollars etc? What does 0.3 of a half dollar look like?

Send in say 7.73 to the convert function.
Step one convert that to a number of cents? ( *100 )
773 cents.
dollars is simple number of cents / 100 which in integer division returns 7.
subtract number of dollars * 100 from number of cents.
73 cents left.
half dollars is number of cents / 50 which returns 1 in integer division.
subtract number of half dollars * 50 from number of cents
23 cents left.
And so on.

That's one way to do it.