Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Compiler warning (level 3) C4013
 
     'function' undefined; assuming extern returning int
 
     An undefined function was called. The compiler assumed an external
     function that returned an int type.
 
     Make sure that the function name is spelled correctly. All external
     functions should be prototyped as extern.
                                    -♦-