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详细说明： C语言的经典书籍 hand, the lines extern int sp; extern double val[]; declare for the rest of the source file that sp is an int and that val is a double array (whose size is determined elsewhere), but they do not create the variables or reserve storage for them. There must be only one definition of an external variable among all the files that make up the source program; other files may contain extern declarations to access it. (There may also be extern declarations in the file containing the definition.) Array sizes must be specified wi th the definition, but are optional with an extern declaration. Initialization of an external variable goes only with the definition. Although it is not a likely organization for this program, the functions push and pop could be defined in one file, and the variables val and sp defined and initialized in another. Then these definitions and declarations would be necessary to tie them together: in file1: extern int sp; extern double val[]; void push(double f) { ... } double pop(void) { ... } in file2: int sp = 0; double val[MAXVAL]; Because the extern declarations ...展开收缩
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