c_缺陷与陷阱（C_ defects and pitfalls）.docVIP

c_缺陷与陷阱（C_ defects and pitfalls） C_ flaws and traps.Txt love a person is difficult, hate a person more difficult, but also love and hate the most difficult person. Love can never be a balance, want to be happy in love, you must be willing to grieve! Some troubles are invented by ourselves, but we accept them as real. C language pitfalls and pitfalls (notes) C language is like a carving knife, sharp, and very useful in the hands of technicians. Like any sharp tool, C hurts people who cant control it. This article introduces how C language hurts careless people and how to avoid harm. The first section examines the problems that can occur when a program is divided into tokens. The second section continues to examine the problems that occur when a programs notation is compiled into statements, expressions, and statements by the compiler. In the third part, we study a C program which consists of several parts which are compiled and bound together. The fourth part deals with conceptual misunderstandings: what happens when a program is executed. The fifth section examines the relationships between our programs and the common libraries they use. In the sixth part, we note that the programs we write may not be the programs we run; the preprocessor will run first. Finally, the seventh part addresses the portability issue: the reason that a program that runs in one implementation can not run in another. Lexical analyzer (lexical analyzer): the inspection program consists of a sequence of characters, and divides them into the mark (token) a mark is composed of one or more characters of the series, it has a language is compiled (related) unified significance. The C program is divided into two tokens. First, the preprocessor reads the program, and it must mark the program to identify identifiers that identify the macro. The macro call is replaced by evaluating each macro, and finally, the program that is replaced by the macro is sent to the compiler by integrating the stream of c