I NEED HELP

[Elie Chahine]

hi, i am new to C++...
i am working on a graded homework..
its a program that asks to:
*enter an amount in $
*let the program display the dollar amount as bills and coins..
Note that 1 quarter = $0.25
1 dime = $0.1
1 nickel = $0.05
1 penny = $0.01
for example:
$62.30 would be split into 3- 20 dollar bills, 0- 10 dollar bills, 0 - 5 dollar bills, 2- 1 dollar bills, 1-quarters, 0 dimes, 1-nickels and 0-pennies.

*the output of $62.30 should be exactly the same as the example
and here where my problem is i am not getting the same
i am getting
3- 20 dollar bills, 0- 10 dollar bills, 0 - 5 dollar bills, 2- 1 dollar bills, 1-quarters, 0 dimes, 0-nickels and 4-pennies.

thats what i wrote:

#include <iostream.h>

void main()
{
int twenty,ten,five,one,quarters,dimes,nickels,pennies,twenty1,ten1,five1,one1;

float amount,total,total1,total2,total3,total4,total5,total6,quarters1,dimes1,nickels1;

cout <<"ENTER THE AMOUNT IN $"
     <<endl;

cin>>amount;

	twenty = amount / 20;
	
	twenty1 = twenty * 20;
	
	total = amount - twenty1;
	
	ten = total / 10;
	
	ten1 = ten * 10;
	
	total1 = total - ten1;
	
	five = total1 / 5;
	
	five1 = five * 5;
	
	total2 = total1 - five1;
    
	one = total2 / 1;
	
	one1 = one * 1;
	
	total3 = total2 - one;
	
	quarters = total3 / 0.25;
	
	quarters1 = quarters * 0.25;
	
	total4 = total3 - quarters1;
	
	dimes = total4 / 0.1;
	
	dimes1 = dimes * 0.1;
	
	total5 = total4- dimes1;
	
	nickels = total5 / 0.05;
	
	nickels1 = nickels * 0.05;
	
	total6 = total5 - nickels1;
	
	pennies = total6 / 0.01;


cout<<endl
    <<"$"<<amount<<" would be split into: "<<twenty<<"-$20 bills, "<<ten<<"-$10 dollar bills, "<<five<<"-$5 bills, "<<one<<"-$1 bills, "
	<<quarters<<"-quarters, "<<dimes<<"-dimes, "<<nickels<<"-nickels and "<<pennies<<"-pennies."
	<<endl;


}

i noticed by outputting all the total variable that total3=0.299999 instead of simply 0.3


what should be the solution in your opinion??

Thank you for your help!

[Elie Chahine]

Thanks for replying :) how nice of you!!

[coder777]

Yes, you get rounding problems. Especially when you mingle int and float.
I'd suggest that you use double for all variables.

[ResidentBiscuit]

Base 10 floating point to binary has some issues. Just use double for variables and you should be fine for most things you'll be doing

[cire]

For this particular problem I wouldn't use double or float variables at all. Rather store your amounts as number of pennies in an integral type, then you're guaranteed accurate representation.

[naraku9333]

While in a production app that requires real precision (anything dealing with real money) you would use integers, you can likely get away with just setting the precision displayed.
std::cout >> setprecision(2)