Floating Point Exception error

Nitsua185 · #1 06-Feb-2009, 00:09

Ok so i have an assignment for a class to write a program that computes the change(in coins) given for anything from 1 to 99 cents. So far here is the code ive put together in about 5 minutes just to check my formulas. Its very incomplete i know but im just trying to get the math part right. When i compile this program, run it, and enter an integer it gives me a "Floating Point Exception" error. Can someone PLEAAASE help me with this.

CPP / C++ / C Code:

#include <string>
#include <iostream>
using namespace std; 

	const int Quart = 25;
	const int Dime = 10;
	const int Nickel = 5;
	const int penny = 1;

int main() 
{
	int change;
	int NumQuarters;
	int NumDimes;
	int NumNickels;
	int NumPennys;
	
	cout << "Please enter an amount of change between 1 and 99 cents: "; 
	cin >> change; 
	
	NumQuarters = change / Quart;
	NumDimes = change % (NumQuarters * Quart) / Dime ;
	NumNickels = change % (Dime * NumDimes) / Nickel;	
	NumPennys = change % (Nickel * NumNickels) / penny;
	
	
	cout << "Quarters: " << NumQuarters << endl;
	cout << "Dimes: " << NumDimes << endl;
	cout << "Nickels: " << NumNickels << endl;
	cout << "Pennies: " << NumPennys << endl;
	
	return 0;
}

ocicat · #2 06-Feb-2009, 01:56

Most likely, one of the Moderators will rightfully deduct reputation points for not enclosing your code with [cpp] before & [/cpp] afterwards which is pointed out in the posting guidelines:

http://www.gidforums.com/t-5566.html

You may find this picky, but we are inundated on a daily basis by those with threads entitled "Help me!" to "I don't understand this!" wanting us to spend time figuring out what has been done wrong. The least you can do is make your request presentable.

Quote:

Originally Posted by Nitsua185

When i compile this program, run it, and enter an integer it gives me a "Floating Point Exception" error. Can someone PLEAAASE help me with this.

Neither have you disclosed what compiler you are using nor what operating system you are targeting, but most likely you have a floating point operation which is not indicated in the code posted which will require that the floating point library be linked into the executable. You should search through the compiler's documentation to ensure that this library is indeed included when linking.

fakepoo · #3 06-Feb-2009, 08:01

Your problem is in all of the following statements:

CPP / C++ / C Code:

NumQuarters = change / Quart;
NumDimes = change % (NumQuarters * Quart) / Dime ;
NumNickels = change % (Dime * NumDimes) / Nickel;	
NumPennys = change % (Nickel * NumNickels) / penny;

Notice what happens when NumQuarters is zero. Then, we have:
NumDimes = change % (0)/Dime....which simplifies to
NumDimes = change % 0....this is the same as dividing by zero. It is not allowed. Here is a simple way to do this:

CPP / C++ / C Code:

NumQuarters = 0;
while(change > Quart)
{
  ++NumQuarters;
  change -= Quart;
}

NumDimes = 0;
while(change > Dime)
{
  ++NumDimes;
  change -= Dime;
}

//...etc.

Nitsua185 · #4 06-Feb-2009, 13:36

Thanks for the help big time FakePoo, that fixed my floating point problem. Now Its giving me a return value for each coin, it gets very close to getting the original amount right buts its two or three off everytime. Sorry to be bothersome, but if you have the time could you explain to me what the following statement means. Specifically the - before the = sign, I havent learned these types of statements yet in my class.

NumQuarters = 0;
while(change > Quart)
++NumQuarters;
change -= Quart;
}

Once I understand exactly what that statement means i should be able to fix whatever is happening in my program to give me the wrong value.

Also heres my new code:

CPP / C++ / C Code:

#include <string>
#include <iostream>
using namespace std; 

	const int Quart = 25;
	const int Dime = 10;
	const int Nickel = 5;
	const int penny = 1;

int main() 
{
	int change;
	int NumQuarters;
	int NumDimes;
	int NumNickels;
	int NumPennys;
	
	cout << "Please enter an amount of change between 1 and 99 cents: "; 
	cin >> change; 
	
	NumQuarters = 0;
	while(change > Quart)
{
	++NumQuarters;
	change -= Quart;
}
    NumDimes = 0;
	while(change > Dime)
{
	++NumDimes;
    change -= Dime;
}
    NumNickels = 0;
	while(change > Nickel)
{
    ++NumNickels;
    change -= Nickel;
}
    NumPennys = 0;
    while(change > penny)
{
	++NumPennys;
	change -= penny;
}
  

	cout << "Quarters: " << NumQuarters << endl;
	cout << "Dimes: " << NumDimes << endl;
	cout << "Nickels: " << NumNickels << endl;
	cout << "Pennies: " << NumPennys << endl;
	
	return 0;

and here are a few runs of the program:

Please enter an amount of change between 1 and 99 cents: 75
Quarters: 2
Dimes: 2
Nickels: 0
Pennies: 4
710 ranger2$ a.out
Please enter an amount of change between 1 and 99 cents: 20
Quarters: 0
Dimes: 1
Nickels: 1
Pennies: 4
711 ranger2$ a.out
Please enter an amount of change between 1 and 99 cents: 54
Quarters: 2
Dimes: 0
Nickels: 0
Pennies: 3

Hehe, im starting to think im not cut out for this stuff, and should change majors immediately.

fakepoo · #5 06-Feb-2009, 13:56

I see the problem. Each if() statement should be >= instead of >.
As for the -=:

CPP / C++ / C Code:

// The following lines mean the same thing
a -= 2;
a = a - 2;

fakepoo · #6 06-Feb-2009, 14:01

Quote:

Originally Posted by Nitsua185

Hehe, im starting to think im not cut out for this stuff, and should change majors immediately.

Nobody understands this stuff immediately. Like anything else, try it for a while and you will grasp more and more of the concepts. Don't be afraid to ask questions. That is what this forum is here for. Good luck.

WaltP · #7 07-Feb-2009, 00:02

You were close with your first program. After figuring out the number of quarters, remove them from change and you won't need any loops at all:

CPP / C++ / C Code:

    NumQuarters = change / Quart;
    change -= NumQuarters * Quart;
    NumDimes = change / Dime;
    change -= NumDimes * Dime;
        etc...

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