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Part II
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This code performs four drawing operations with the red color. The code in the block controlled by for is repeated a given number of times. When the loop finishes, the final DrawString puts the yellow version on top of all the red ones. Note that the yellow DrawString is not repeated four times because it is not inside the block of code controlled by the for loop. The loop itself is controlled by the three items in brackets that follow the key word for. These are shown in Figure 5-10. Each of the three items is used to manage the behavior of the loop.
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Begin Test condition Change for loop for ( layer = 0 ; layer < 4 ; layer++ )
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gameSpriteBatch.DrawString(font,nowString,nowVector,Color.Red); nowVector.X++; nowVector.Y++;
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FIGURE 5-10 How a for oop s constructed.
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Begin This is a statement that is obeyed when the loop starts. In this example, you re using an integer variable called layer to count each of the layers that you re drawing, and the loop must set this to zero at the beginning. Test Condition The condition controls when the loop finishes. It can be either true (the loop continues) or false (the loop ends). The condition in your loop is layer < 4. You might not have seen the < operator before; it performs a less-than comparison between the two operands. If the item on the left is less than the item on the right, the result of the comparison is true. If the item on the left is not less than the item on the right, the result of the comparison is false. C# provides a range of different comparison operators. Change Each time the statements in the loop are completed, the change is performed. In this case, the change statement layer++ makes the value in layer 1 larger each time. After the change has been performed, the test condition is evaluated to see whether the statements controlled by the loop are to be executed again.
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5
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The C# compiler has the job of producing the machine instructions that perform the loop when the program runs. The precise sequence that s followed by the code that the compiler produces is as follows: 1. Perform the Begin statement to start the loop. 2. Perform the Test and finish if the test is false. 3. Perform the statement in the loop body. 4. Perform the Change statement. 5. Return to step 2. Sample Code: 3-D Big Clock The samp e project n the 03 3D B g C ock d rectory n the
resources for th s chapter conta ns an XNA Game Stud o so ut on that uses a for oop to draw mu t p e vers ons of the t me
Other Loop Constructions
C# also provides two other loop constructions, called do while and while. These are not actually vital, in that you can always get the looping behavior that you want by using an appropriately designed for loop, but they can be useful in situations where you don t want to go to the trouble of creating a for loop construction. You can find out more about these kinds of loops and when they would be useful in the glossary in the do while entry.
Fun with for Loops
You can test your understanding of the for loop behavior by looking at some for loops and trying to work out what they would do. For instance, look at this one:
for (layer = 0 ; layer > 4 ; layer++)
There s a mistake in this statement, but it s rather hard to spot. The mistake is that the test is now layer > 4. The > character means greater than. This means that the test is now true only when the value of layer is greater than 4. Because the initialization sets the value of layer to 0, this condition is never true. The result is that the code in the statement controlled by the loop is never performed. Now look at this statement:
for (layer = 0 ; layer < 4 ; layer--)
There s another mistake here. The less-than character (<) is in the correct place, but rather than increasing the value of layer each time around, the change makes layer smaller by using the -- operator each time. This means that the value of layer never becomes greater than 4, so the loop never ends. The result is that your program appears to get stuck at this point.
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