How to print a double with 4 houses after the dot in C#?

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static void Main(string[] args)
{
    double area, raio , pi;
    pi = 3.14159;       
    raio = Convert.ToDouble(Console.ReadLine());
    area = pi * Math.Pow(raio,2);
    Console.WriteLine("A={0}\n",area.ToString("N0"));
}

The input value is 2.00 and the expected output value is 12.5664; however, what is coming out is 125.664. How can I correct this?

c# .net formatting double

1 answer

3


If you want 4 houses can not use 0. I did it in a way that avoid breaking the application by wrong typing and using what the language already offers:

using static System.Console;
using static System.Math;

public class Program {
    public static void Main(string[] args) {
        if (double.TryParse(ReadLine(), out var raio)) WriteLine($"A = {PI * Pow(raio, 2):N4}");
    }
}

Behold working in the ideone. And in the .NET Fiddle. Also put on the Github for future reference.

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