Thread: Won't Convert

This code will convert Celsius to Fahrenheit, but it will not convert Fahrenheit to Celsius can any one help me its my first program really on my own. its a fairly simple Program but im 15yr old so gotta start somewhere

Code:

#include <iostream>
using namespace std;
int main()
{
	double far;
	double cel;
	int choice;
	do{
		cout <<"1. Celsius to Fahrenheit.\n"<<"2. Fahrenheit to Celsius\n"<<"3. Exit\n"<<"Your choice ( 1-3 ): ";
		cin >>choice;
		switch (choice){
			case 1:
				cout<<"Please Enter Degrees in Celsius: ";
					cin>>cel;
					far = ((9/5) * cel +32;
						cout<<"Degrees in Fahrenheit is: "<<far<<"\n";
						break;
			case 2:
				cout<<"Please Enter Degrees in Fahrenheit: ";
					cin>>far;
					cel = (5/9) * (far-32);
						cout<<"Degrees in Celsius is: "<<cel<<"\n";
					break;
			case 3:
				cout<<"Good bye\n";
				exit;
				break;
			default:
				cout<<"Please Enter a Valid choice 1-3. Thank You.";
				break;
		}
	}while(choice !=3);
		system("Pause");
}

When i made the variables into floats instead of doubles it said something about failure to convert double to float possible loss of data but it works fine with doubles thank you

Originally Posted by baitman18

When i made the variables into floats instead of doubles it said something about failure to convert double to float possible loss of data but it works fine with doubles thank you

That's because things like 9.0/5.0 will be computed as a value of type double, and conversion of that back to type float implies a reduction of precision. If you want things to work with float variables, make these 9.0f/5.0f.