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C# increment and decrement operators

William Richardson
on
961 Views
Last Modified: 2012-05-06
I'm just starting to read a C# book.  I would like to find out why running a program gave me the results it did.

/* This is a program that I'm writing
   to see if I can figure out */

class TryThis
{

  public static void Main()
  {

    // postfix increment
    int length = 3;
    int newLength = length++;
    System.Console.WriteLine("Postfix increment example");
    System.Console.WriteLine("length = " + length);
    System.Console.WriteLine("newLength = " + newLength);

    // prefix increment
    length = 3;
    newLength = ++length;
    System.Console.WriteLine("Prefix increment example");
    System.Console.WriteLine("length = " + length);
    System.Console.WriteLine("newLength = " + newLength);

    // postfix decrement
    length = 3;
    newLength = length--;
    System.Console.WriteLine("Postfix decrement example");
    System.Console.WriteLine("length = " + length);
    System.Console.WriteLine("newLength = " + newLength);

    // prefix decrement
    length = 3;
    newLength = --length;
    System.Console.WriteLine("Prefix decrement example");
    System.Console.WriteLine("length = " + length);
    System.Console.WriteLine("newLength = " + newLength);

  }

}

This is the result:


C:\Documents and Settings>trythis
Postfix increment example
length = 4
newLength = 3
Prefix increment example
length = 4
newLength = 4
Postfix decrement example
length = 2
newLength = 3
Prefix decrement example
length = 2
newLength = 2

C:\Documents and Settings>

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