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// app.cs - A sample C# application 
//-----------------------------------------------  
   
using System; 
   
class sample 
{   
    public static void Main() 
    { 
        //Declare variables 
   
        int radius = 4; 
        const double PI = 3.14159; 
        double area; 
   
        //Do calculation 
           
        area = PI * radius * radius; 
   
        //Print the results 
   
        Console.WriteLine("Radius = {0}, PI = {1}", radius, PI ); 
        Console.WriteLine("The area is {0}", area); 
    } 
}