Hi:

I am a newbie trying to learn C++. Our instructor gave us several assignments already and I am struggeling with the last one. Here are the instructions:

Write a C++ program that calculates exact change. In order to receive full credit, please remember that only int arithmetic is exact, so you'll need to break up your double into two ints, the one before the decimal point and the one after the decimal point.

Enter the sales price: 5.66
Enter the cash paid: 10.75
Here's your change: 5.09
5 dollars, 1 nickel and 4 pennies
Want to try again? [y/n] n

I definitely don't expect anybody to write the program for me but I need help with regards to the point where he wants us to convert the input of type DOUBLE to 2 INTEGERS... so let's say $5.66 will be INT 5 and INT 66, then I do the same thing with the 10.75... BUT HOW CAN I CALCULATE THE DIFFERENCE??? Do I have to put them back together? I am so confused and I need it by tomorrow morning to get any credit for it!!!

I appreciate any help you guys can give me...

Cheers,

Stefan

Okay to start off with consider the following
(as a guide)

to get the dollar value use the int function
if SalesPrice is a double
DollarSP = int (SalesPrice)
CentSP = (SalesPrice*100)-DollarSP

(or you could multiply the input values by 100 and then convert to ints - , and display your results differently *starts to go off on a tangent* .....)

In your example it's easy:

10.75 - 5.66 = 5.09 becomes

75 - 66 = 9
10 - 5 = 5 becomes 5.09

Where you have to worry is this example:

10.66 - 5.75 - 4.91

66 - 75 = ??

You'll have to 'borrow' 100 from the dollar side so that you'll have

166 - 75 = 91
9 - 5 = 4

If the teacher doesn't require that you use your method, it seems that it would be easier to multiple the dollar amounts by 100, then convert to int, do the arithmetic and then convert back..

10.75 - 5.75 = 5.09

mult by 100

1075.00 and 575.00

convert to int

1075 and 575

subtract 1075 - 575 = 509

convert to double

5.09

Be sure to come back and let us know if our suggestions helped!

Thanks a lot for all your help... I eventually figured it out myself and used an if-statement for the borrowing part...

Thanks a lot!

Stefan