factor program

**krazykrisi** · 09-26-2006

I need some help with this program, it is homework but I can't figure it out. This is what I have to do:

Modify the FACTOR program in this chapter so that it repeatedly asks for a number and calculates its factorial, until
the user enters 0, at which point it terminates. You can enclose the relevent statements in FACTOR in a while loop or a
do loop to achieve this effect.

Here is what I have thus far:

Code:

#include <iostream>
using namespace std;

int main()
{
	unsigned int numb;
	unsigned long fact=1;	//long for larger numbers

	cout << "Enter a number: ";
	cin >> numb;	//get number
	for(int j=numb; j>0; j--)	//multiply 1 by
		fact *= j;				//numb, numb-1, ..., 2, 1
	cout << "Factorial is " << fact << endl;
	int dummy;
	cin >> dummy;
	return 0;
}

**SlyMaelstrom** · 09-26-2006

That just looks like the unmodified factorial program that's in the book... You're supposed to wrap it in a loop that breaks when the user enters '0'. Did you learn about loops, yet?

...and get those "dummy" statements out of there and just replace it with a

Code:

cin.ignore();
cin.get();

**krazykrisi** · 09-26-2006

yeah I'm just learning loops. It is from what is in the book but I can't figure out how to change it to what it is asking for. Can you give me a hint or something?

**SlyMaelstrom** · 09-26-2006

I gave you a hint... use a loop.

Here is a few more...

Read your book.
Ask your teacher.
...and if you're still expecting code, then perhaps you should read the Homework Policy.

All you need is a loop. It's literally two lines of code and one of them is a closing brace. If you want to work around your factorial calculation and output on zero then it's 3-4 lines of code tops. Which means, sans studying loops (which by the way... you WILL be using if you plan on continuing programming past this assignment) this is at a maximum a 60 second assignment. So read your book, learn loops, and just do it.

**maxorator** · 09-27-2006

Originally Posted by SlyMaelstrom

That just looks like the unmodified factorial program that's in the book... You're supposed to wrap it in a loop that breaks when the user enters '0'. Did you learn about loops, yet?

...and get those "dummy" statements out of there and just replace it with a

Code:

cin.ignore();
cin.get();

Why don't you like << and >> operators?

**laserlight** · 09-27-2006

Why don't you like << and >> operators?

Formatted input in not necessary here, and cin.ignore()/cin.get() is somewhat more canonical.

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