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15. False. You don t need to add an else part to an if condition unless your program needs it. 16. True. A recipe tells you how to combine and process ingredients to cook something. An algorithm gives a sequence of actions that you can perform to achieve something. 17. False. A single equals character ( ) is used to assign a value to a variable. 18. True. The methods provide the class with things it can do (behaviors) and a place to hold information (data). 19. False. PlayGame sounds like a good identifier for a method (an action of some kind), but it is not a good name for a class. Classes have names like Sprite, Session, Game, Invoice, and Car. A class represents a whole thing that you want to create and interact with, not just a single action. 20. True. Explode is a word that implies that an action is being performed; perhaps we are going to make one of our game objects perform an explosion behavior. Method names should be doing words, like verbs. 21. False. A byte holds 8 bits organized in one lump. Each of the bits can be either true or false, which means that a byte can actually occupy 256 different states. 22. False. ++ works on a single numeric operand and makes the value in the thing it works on one bigger. We use it to increase the intensity of the color values in our program. It has a complementary -- operator. 23. False, for two reasons. One is that the compiler does not have control when your program runs. It just prepares the program for execution, so there is no way that it can react to things that happen when the program runs. The second reason is that when some numbers overflow (for example, if we try to overfill the byte type), the processor typically doesn t notice. We have to make sure that the values in our programs always stay within the range of the variables that we create to hold them. 24. True. In programs, we often need to represent things that can be either true or false. These allow us to decide whether we do something (true) or not (false).
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1. False. A method does something. A desk is just a holder for values. It is more sensible to regard a method as a person in the office who can do something when the method is called. 2. False. The compiler converts your C# source code into machine language instructions for the computer, Zune, or Xbox, but it is not around when your program is running. The class instances are created when the program runs. 3. False. You need to add the else part only if you want to perform some other statement or block of statements if the condition is not true.
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Answers to the Review Questions
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4. False. The parameter feeds information into a method. 5. False. It is performed only if the condition controlling the if statement is false when the program runs. 6. False (aren t we having a lot of false answers this time ). The gamepad is represented by a special Microsoft XNA structure that holds all the gamepad settings. The structure is called GamePadState. 7. False. This method gives your program a GamePadState structure. You can use the GamePadState structure to find out what the button state is. 8. True (at last). This is exactly what a block is. 9. True. The logical expression (true || false) works out to true, as do (true || true) and (false || true). In fact, the only condition involving explicit values and a single logical OR operator that works out false is (false || false). 10. False. I feel terrible about this one. The condition is fine, but it does not test the value of greenIntensity. 11. False. We may have to do this ourselves when the game is stopped.
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