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   printf

   Usage
   #include <stdio.h>
   int printf(const char *format,...);

   Description
   printf  is  the formatted print routine, it writes its  characters  to
   stdout.

   Arguments  are  interpreted according to the  zero  terminated  format
   string.  The format string is a sequence of characters  with  embedded
   conversion  commands. Characters that are not part of  the  conversion
   command  are output. For a full list of the conversion commands  refer
   to the entry for fprintf.

   Example
   See fprintf

   Return Value
   Returns the number of characters written. If an output error occurred,
   then a negative integer is returned.