using System;

​

double addUp(int a, int b)

{

    return (a + b);

}

​

System.Console.WriteLine("- ++ " + addUp(5, 5) + " + " + addUp(18, 2) + " ++ -----" );

System.Console.WriteLine("--- ++ " + addUp(10, 20) + " + " + addUp(11, 29) + " ++ ---" );

System.Console.WriteLine("----- ++ " + addUp(23, 27) + " + " + addUp(32, 28) + " ++ -" );

​

System.Console.WriteLine();

​

// void w/ no parameters and getting user input

​

void oldEnoughToRentCar()

{

    System.Console.WriteLine("What is your name?: ");

    string name = System.Console.ReadLine();

    System.Console.WriteLine("How old are you?: ");

    int age = int.Parse(Console.ReadLine());

​

    if ( age >= 25 )

    {

        System.Console.WriteLine("My name is " + name + " and I am old enough to rent a car.");

    }

    else

    {

        System.Console.WriteLine("My name is " + name + " and I am NOT old enough to rent a car.");

    }

}

​

oldEnoughToRentCar();

​

// Example using parameters

​

System.Console.WriteLine("==== ==== ==== ==== ==== ==== ==== ==== ==== ====");

System.Console.WriteLine();

​

System.Console.WriteLine("...and next I used the parameters to define and show output:"); 

​

void oldEnoughToRentCar(string name, int age)  // void with parameters, using same varable above

{

    if ( age >= 25 )

    {

        System.Console.WriteLine("My name is " + name + " and I am old enough to rent a car.");

    }

    else

    {

        System.Console.WriteLine("My name is " + name + " and I am NOT old enough to rent a car.");

    }

}

​

// Outputs

​

oldEnoughToRentCar("Dave", 16);

​

System.Console.WriteLine();

​

oldEnoughToRentCar("Dave", 24);

​

System.Console.WriteLine();

​

oldEnoughToRentCar("Dave", 38);

​

System.Console.WriteLine();

​