The C Preprocessor

摘要: You can think of the C preprocessor as a separate program that runs before compiler, with its own simple, line-oriented grammar and syntax. In previous chapters, we introduced two directives—the #define command for naming constant #include including additional source files. This chapter discusses both these directives in greater detail also describes other have not been mentioned yet. Briefly, gives you following capabilities: Macro processing. Inclusion files. “Conditional compilation,” which enables to conditionally compile sections contingent on value an arithmetic expression.