c# - Convert from Fahrenheit to Celsius

Question

I'm trying to convert a Fahrenheit temperature into Celsius.
doing the following I'm always getting zero:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Celcius_Farenheit_Converter
{
class Program
{

    static double Celcius(double f)
    {
        double c = 5/9*(f - 32);

        return c;
    }
    static void Main(string[] args)
    {
        string text = "enter a farenheit tempature";
        double c = Celcius(GetTempature(text));
        Console.WriteLine("the tempature in Celicus is {0}", c);

        Console.ReadKey(true);

    }

    static double GetTempature(string text)
    {
        Console.WriteLine(text);
        bool IsItTemp = false;
        double x = 0;

        do
        {
            IsItTemp = double.TryParse(Console.ReadLine(), out x);
        } while (!IsItTemp);

        return x;

    }
}
}

can you help me fix it?

Answer 1

5/9 performs an integer division—that is, it always discards the fractional part—so it will always return 0.

5.0/9.0 performs floating-point division, and will return the expected 0.55555...

Try this instead:

static double Celcius(double f)
{
    double c = 5.0/9.0 * (f - 32);

    return c;
}

Further Reading

• / Operator (C# Reference)