Beginning C : from novice to professional by Ivor Horton PDF

By Ivor Horton

ISBN-10: 1430202432

ISBN-13: 9781430202431

ISBN-10: 1590597354

ISBN-13: 9781590597354

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There are 3 cookies left I have eaten three more. Now there are 0 cookies left Total energy consumed is 625 calories. How It Works You first declare and initialize three variables of type int: int cookies = 5; int cookie_calories = 125; int total_eaten = 0; /* Calories per cookie */ /* Total cookies eaten */ You’ll use the total_eaten variable to accumulate the total number of cookies eaten as execution of the program progresses, so you initialize it to 0. fm Page 34 Friday, September 22, 2006 1:27 PM 34 CHAPTER 2 ■ FIRST STEPS IN PROGRAMMING The result of the subtraction is stored back in the variable cookies, so the value of cookies will now be 3.

The assignment statement that appeared later set the value to 2, but it would be much better to initialize the variable when you declare it. You can do this with the following statement: int Cats = 2; This statement declares the variable Cats as type int and sets its initial value to 2. Initializing variables as you declare them is a very good idea in general. It avoids any doubt about what the initial values are, and if the program doesn’t work as it should, it can help you track down the errors.

Because the comments are ignored by the compiler, this is exactly the same as the following statement: int Total_Pets, Cats, Dogs, Ponies, Others; You can spread C statements over as many lines as you want. The semicolon determines the end of the statement, not the end of the line. Now back to the program. The variables are given specific values in these four assignment statements: Cats = Dogs = Ponies Others 2; 1; = 1; = 46; At this point the variable Total_Pets doesn’t have an explicit value set.

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Beginning C : from novice to professional by Ivor Horton


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