Problem with calculatoion

[pwnedu46]

It compiled, but there's an error in the formula to convert farenheit to celcius. No matter what I put in, it always gives me

 ___ Degrees F = -0 Degrees C 

The ___ is the input, not what it actually prints.

I have the code:

//convert temperature
#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
	int choice;
	double cel,far;
	while(1)
	{
		cout << "Choice (1 = Farenheit to Celcius, 2 = Celcius to Farenheit, 3 = CLS) " << endl;
		cin >> choice;
		switch(choice)
		{
			case 1: // F > C
				cout << "Degrees F: ";
				cin >> far;
				cel = ((far-32)*(5/9)); 
				cout << endl << far << " Degrees F = " << cel << " Degrees C" << endl;
				break;
			case 2:
				cout << " Degrees C:  ";
				cin >> cel;
				far = (cel*(9/5)+32);
				cout << endl << cel << " Degrees C = " << far << "Degrees F" << endl;
				break;
			case 3:
				system("CLS");
				break;
			default:
				cout << "Invalid input" << endl;
				break;
		}
	}
	return 0;
}

EDIT:
Celcius to farenheit and the CLS option both work fine.

[Tamao]

Your calculations should be like this: (far - 32) * 5/9

[pwnedu46]

Thanks Tamao. It's working now. I should stop using so many parenthasis.

[jsmith]

Just as an aside...

Some people like to put in extra parentheses to make order of operations explicit, and some don't.
I myself prefer minimal parens because I find over-parenthesizing an expression to detract from readability rather than enhance it.

Anyway, yes, in this case parenthesizing (5/9) causes the division to be performed in the integer domain since both divisor and dividend are integral (which is of course not what you wanted).