Microsoft C version 7.0 conforms to the standard for the C language as set forth in the American National Standard (hereinafter referred to as the ANSI C standard). Microsoft extensions to the ANSI C standard are noted in the text and syntax of this manual as well as in the online reference. Because the extensions are not a part of the ANSI C standard, their use may restrict portability of programs between systems. By default, the Microsoft extensions are enabled. To disable the extensions, specify /Za on the command line. With /Za, all non-ANSI code generates errors or warnings.