using System;
public class Program
{
static void sin()
Console.WriteLine("1");
}
static void tan()
static void cos()
public static void Main()
Console.WriteLine("Press 1, 2, or 3 to run a different method:");
string userInput = Console.ReadLine();
switch (userInput)
case "1":
sin();
break;
case "2":
tan();
case "3":
cos();
default:
Console.WriteLine("Invalid input, please press 1, 2, or 3.");
