//csc question_operator.cs
using System;
class Question_Operator
{

static double eval_sin(double param)
{
return param !=0.0 ? Math.Sin(param)/param : 1.0;

}
public static void Main()
{
Console.WriteLine(eval_sin(0.0));
Console.WriteLine(eval_sin(0.11));
Console.WriteLine(eval_sin(0.21));
Console.WriteLine(eval_sin(0.15));
}

}//end of the class