By Peter A. Darnell

The writer begins with the idea that C is a superb language for software program engineering tasks. The booklet con- centrates on programming style,particularly clarity, maintainability, and portability. files the proposed ANSI ordinary, that's anticipated to be ratified in 1987. This ebook is designed as a textual content for either newbie and inter- mediate-level programmers.

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You do this by using a preprocessor directive called #define. For instance, #define NOTHING 0 binds the name "NOTHING" to the constant zero. The two symbols "NOTHING" and "0" now mean the same thing to the compiler. The statements, j j = 5 + 0; = 5 + NOTHING; are exactly the same. The rules for naming constants are the same as the rules for naming variables, but you must be careful not to confuse the two. For example, having defined NOTHING as zero, you cannot write: NOTHING = j+5; any more than you can write: o= j+5; In both cases, the compiler should issue an error since you are attempting to change the value of a constant.

Object code represents an intermediary step between the source code and the final executable code. The final steps are handled by two additional utilities called the linker (or binder) and the loader. 2 Linking Object Files After creating object files by invoking the compiler, you would combine them into a single file by invoking the linker. In addition to combining object files, the linker also links in functions from the runtime library if necessary. The result of the linking stage is an executable program.

The rules for composing names are the same regardless of what you are naming. Names may contain letters, numbers, and the underscore character _, but must start with a letter or underscore. Names beginning with an underscore, however, are generally reserved for internal system variables. The C language is case sensitive which means that it differentiates between lowercase and uppercase letters . So the names, VaR var VAR are all different. The advantage of case sensitivity is that you have more names to choose from, but it also means that you should follow strict naming conventions to ensure readability and maintainability.

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