The C library printf family of functions

The printf family consists of _printf(), printf(), _fprintf(), fprintf(), vprintf(), and vfprintf(). All these functions use __FILE opaquely and depend only on the functions fputc() and ferror(). The functions _printf() and _fprintf() are identical to printf() and fprintf() except that they cannot format floating-point values.

The standard output functions of the form _printf(...) are equivalent to:

fprintf(& __stdout, ...) 

where __stdout has type __FILE.

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