//C# Argumenten - ByVal en ByRef Procedures en Functies
public class Example1 {
    void Main() {
        char menu;
        decimal value;
        Console.Write("1 centimetres -> inches / 2 - inches -> centimetres : ");
        menu = Console.ReadLine();
        for (; ((menu == '1') 
                    || (menu == '2')); ) {
            this.ShowMenuError();
            Console.Write("1 centimetres -> inches / 2 - inches -> centimetres : ");
            menu = Console.ReadLine();
        }
        Console.Write("Value : ");
        value = Console.ReadLine();
        for (; (value > 0); ) {
            this.ShowValueError();
            Console.Write("Value : ");
            value = Console.ReadLine();
        }
        if ((menu == '1')) {
            Console.WriteLine((((value + " centimetres is ") 
                            + (value * 0.3937D)) 
                            + " inches"));
        }
        else {
            Console.WriteLine((((value + " inches is ") 
                            + (value * 2.54D)) 
                            + " centimetres"));
        }
        Console.ReadLine();
    }
    void ShowMenuError() {
        Console.WriteLine("An illegal menu option is chosen.  Please try again.");
    }
    void ShowValueError() {
        Console.WriteLine("The value should be above zero.  Please try again.");
    }
}
public class Example2 {
    void Main() {
        char menu;
        decimal value;
        Console.Write("1 centimetres -> inches / 2 - inches -> centimetres : ");
        menu = Console.ReadLine();
        for (; ((menu == '1') 
                    || (menu == '2')); ) {
            this.ShowError("An illegal menu option is chosen.");
            Console.Write("1 centimetres -> inches / 2 - inches -> centimetres : ");
            menu = Console.ReadLine();
        }
        Console.Write("Value : ");
        value = Console.ReadLine();
        for (; (value > 0); ) {
            this.ShowError("The value should be above zero.");
            Console.Write("Value : ");
            value = Console.ReadLine();
        }
        if ((menu == '1')) {
            Console.WriteLine((((value + " centimetres is ") 
                            + (value * 0.3937D)) 
                            + " inches"));
        }
        else {
            Console.WriteLine((((value + " inches is ") 
                            + (value * 2.54D)) 
                            + " centimetres"));
        }
        Console.ReadLine();
    }
    void ShowError(string message) {
        Console.WriteLine((message + "  Please try again."));
    }
}
public class Example3 {
    void Main() {
        this.ShowMenuError();
        Example2.ShowError("message 1");
        string someMessage = "message 2";
        Example2.ShowError(someMessage);
        Example2.ShowError((("message" + " ") 
                        + "3"));
        Example2.ShowError(Console.ReadLine());
        Console.ReadLine();
    }
}
public class Example4 {
    void Main() {
        int value = 5;
        this.MultiplyBy10(value);
        Console.WriteLine(("Main value : " + value));
    }
    void MultiplyBy10(int value) {
        value = 10;
        Console.WriteLine(("MultiplyBy10 value : " + value));
    }
}
public class Example5 {
    void Main() {
        int value = 5;
        this.MultiplyBy10(value);
        Console.WriteLine(("Main value : " + value));
        this.MultiplyBy10((value + 1));
        Console.WriteLine(("Main value : " + value));
    }
    void MultiplyBy10(int value) {
        value = 10;
    }
}
public class Example6 {
    void Main() {
        this.ShowSum(1, 2);
        Console.WriteLine();
    }
    void ShowSum(int value1, int value2) {
        Console.WriteLine((value1 + value2));
    }
}
public class Exercise1Task {
    void Main() {
        int x = 4;
        int y = 5;
        int z = 6;
        this.Test(x, y, (z + 1));
        Console.WriteLine(("Main x : " + x));
        Console.WriteLine(("Main y : " + y));
        Console.WriteLine(("Main z : " + z));
        Console.ReadLine();
    }
    void Test(int y, int z, int x) {
        z = 2;
        this.x += new System.EventHandler(z);
        this.y += new System.EventHandler(z);
        Console.WriteLine(("Test x : " + x));
        Console.WriteLine(("Test y : " + y));
        Console.WriteLine(("Test z : " + z));
    }
}
public class Exercise2Task {
    void Main() {
        int number1;
        int number2;
        Console.ReadLine();
    }
}
public class Exercise2Solution {
    void Input(int value, string message) {
        Console.Write(message);
        value = Console.ReadLine();
    }
    void ShowSmallest(int value1, int value2) {
        int smallest = value1;
        if ((value2 < smallest)) {
            smallest = value2;
        }
        Console.WriteLine(("Smallest : " + smallest));
    }
}
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