c:io:vscanf_vfscanf_vsscanf

Syntax:

    #include <cstdarg>
    #include <cstdio>
    int vscanf( char *format, va_list arg_ptr );
    int vfscanf( FILE *stream, const char *format, va_list arg_ptr );
    int vsscanf( char *buffer, char *format, va_list arg_ptr );

These functions are very much like scanf(), fscanf(), and sscanf(). The difference is that the argument list is a pointer to a list of arguments. va_list is defined in cstdarg, and is also used by va_arg. For example:

     int scanf_( char *fmt, ... ) {
       va_list args;
       va_start( args, fmt );
       int r = vscanf(frmt, args);
       scanf("%*[^\n]"), getchar(); //Empty buffer
       va_end( args );
       return r;
     }