Download Beginning C : from novice to professional by Ivor Horton PDF

By Ivor Horton

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A variable name can’t include any other characters besides letters, underscores, and digits, so Hash! and Mary-Lou aren’t allowed as names. This last example is a common mistake, but Mary_Lou would be quite acceptable. Because spaces aren’t allowed in a name, Mary Lou would be interpreted as two variable names, Mary and Lou. Variables starting with one or two underscore characters are often used in the header files, so don’t use the underscore as the first letter when naming your variables; otherwise, you run the risk of your name clashing with the name of a variable used in the standard library.

When you write a computer program in C, the compiler must convert your source code to machine code, and so there must be some very strict rules governing how you use the language. Leave out a comma where one is expected, or add a semicolon where you shouldn’t, and the compiler won’t be able to translate your program into machine code. You’ll be surprised just how easy it is to introduce typographical errors into your program, even after years of practice. If you’re lucky, these errors will be picked up when you compile or link your program.

Note that you could have declared all five variables in a single statement and include comments, as follows: int Total_Pets, Cats, Dogs, Ponies, Others; /* /* /* /* /* The The The The The total number of pets number of cats as pets number of dogs as pets number of ponies as pets number of other pets */ */ */ */ */ These are rather superfluous comments but they illustrate the point. The statement is spread over several lines so that you can add the comments in an orderly fashion. Notice that there are commas separating each of the variable names.

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