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  Include:   <stdio.h>, <stdarg.h>
 
  Syntax:    int vfprintf( FILE *stream, char *format, va_list argptr );
 
             int vprintf( char *format, va_list argptr );
 
             int vsprintf( char *buffer, char *format,
                           va_list argptr );
 
  Returns:   the number of characters written, or a negative value if
             an error occurs.
 
  See also:  fprintf, printf, sprintf, va_arg, va_end, va_start
             ◄printf Formatting Table►
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