XNA Game-Themed CS1 Examples (XGC1)

Release 2.0 (XNA V3.1)
2/8/2010

Topic: Topic.5.RepetitionStructures
Example: Ex_14.CountBackwards

Repetition: Counting Down Using A For Loop


References:

Goals:



1. Obtain the example code

Download and unzip the zip file and you will see an ExampleProgram folder. Open the ExampleProgram folder, the EXE folder contains the compiled program and you can double click on the .sln file to work with the source code.

When the game starts, you'll see a screen that looks similar to this:


The program for this tutorial is almost exactly identical to the program used in the the previous tutorial.  The difference is that for this tutorial, we're using a for loop to count down rather than up (to count backwards rather than forwards)


2. Examining The Program:

Let's examine the C# source code that produces the behavior we see on-screen


FURTHER EXERCISES:: 

  1. Start from a blank starter project (1000.201, if you need it), and re-do the code from memory as much as possible.  On your first try, do what you can, and keep the above code open so that when you get stuck, you can quickly look up what you forgot (and that after you finish a line, so that you can compare your line to the 'correct' line).  On the next try, do the same thing, but try to use the finished code less.  Repeat this until you can type everything, without refering the tutorial's code.
  2. Go back through the previous tutorials, and re-implement the code, using loops that count down, rather than up.  Your instructor may have a specific list of tutorials (and exercises from those tutorials) that you will implement.

Project home page: The Game-Themed Introductory Programming Project.
Kelvin Sung
Computing and Software Systems
University of Washington, Bothell
ksung@u.washington.edu
Michael Panitz
Business And Information Technology
Cascadia Community College
mpanitz@cascadia.eduu

Microsoft Logo This work is supported in part by a grant from Microsoft Research under the Computer Gaming Curriculum in Computer Science RFP, Award Number 15871 and 16531.
2/8/2010