public static double cm(double num)
public static double m(double num)
public static double km(double num)
public static void Main()
Console.WriteLine("press 1 for inches to cm, press 2 for feet to metres, press 3 for mile to km");
int option = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("enter value that needs to be converted");
double num = Convert.ToDouble(Console.ReadLine());
Console.WriteLine(cm(num)+" cm");
Console.WriteLine(m(num)+" m");
Console.WriteLine(km(num)+" km");
Console.WriteLine("wrong input!");