XNA Game-Themed CS1 Examples (XGC1)

Release 2.0 (XNA V3.1)

Topic: Topic.6.Arrays
Example: Ex_6.SearchBlocksWithWhile

Arrays: Linear Search Through An Array (While Loop)



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 is nearly identical to the earlier tutorial, 260.PongSoccerWithArray.  The only change for this tutorial is that we're doing our linear search using a while loop, rather than a for loop.

2. Examining The Program:

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


  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. Listing All Matches
    For this exercise, you should use the same project that was explained in the above tutorial.
    Modify the program so that instead of displaying the contents of the m_NumbersToSearchThrough array along the top, you instead display all the rectangles that the soccer ball overlaps.  If the soccer ball is overlapping no rectangles, then display a message like "No overlapping rectangles".  If the soccer ball only overlaps rectangle #5, then display something like "Overlap with #5", and if the soccer ball overlaps #5 and #6, display something like "Overlap with #5, #6".

Project home page: The Game-Themed Introductory Programming Project.
Kelvin Sung
Computing and Software Systems
University of Washington, Bothell
Michael Panitz
Business And Information Technology
Cascadia Community College

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.