Аннотация
M4 is a macro processor available on UNIX\dag and GCOS. Its primary use has been as a front end for Ratfor for those cases where parameterless macros are not adequately powerful. It has also been used for languages as disparate as C and Cobol. M4 is particularly suited for functional languages like Fortran, PL/I and C since macros are specified in a functional notation. M4 provides features seldom found even in much larger macro processors, including •arguments
•condition testing
•arithmetic capabilities
•string and substring functions
•file manipulation
This paper is a user's manual for M4.
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