using System;

public class Program

{

    public static void Main()

    {

         //to accept user input, use Console.ReadLine()

            //which creates a prompt and returns a string

            //containing everything the user typed before hitting

            //enter

​

            Console.WriteLine("Press enter to continue");

            Console.ReadLine(); //waits until the hit enter

                                //but the value they entered is lost 

            Console.WriteLine("You pressed enter!");

​

​

            //We need to restore the return value in a string if

            //we want to keep it

            Console.Write("\nEnter your favorite food: ");

            string food = Console.ReadLine();

            Console.WriteLine("So, you like to eat " + food + ".");

​

            //We can use any string methods on a stored string

            Console.WriteLine("The first letter of that is " + food[0]);

            food = food.Replace("b", "t").Replace("a", "u");

            Console.WriteLine("I call that " + food + "!");

​

            //To turn a string into a numerical value for calculations,

            //we use the Convert class. Common Convert methods:

            //Convert.ToInt32(string)

            //Convert.ToDouble(string)

            Console.Write("\nEnter a number!: ");

            string entry = Console.ReadLine();

            double num = Convert.ToDouble(entry);

            Console.WriteLine("Twice that number is " + (num * 2));

​

            Console.Write("Enter an integer: ");

            //Read in and convert it in a single line of code

            int num2 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Half that number is " + (num2 / 2.0));

    }

}