vprintf - Formatted output to the standard output

Definition	#include <stdio.h> int vprintf(const char *format, va_list arg); vprintf is similar to the printf function except that, unlike printf, vprintf permits the output of arguments whose number and data types are not known at compilation time. vprintf is used within functions to which the caller can pass a different format string and different arguments for output each time. The formal parameter list of the function definition provides for a format string format and a variable argument list ", ..." for this purpose. format is a format string as described under printf with ANSI functionality (see printf). vprintf successively steps through an argument list arg using internal va_arg calls and writes the arguments according to format string format on the standard output stdout. The variable argument list arg must be initialized with the va_start macro before vprintf is called.
Return val.	Number of characters output
		if successful.
	Integer< 0	if an error occurs.
Notes	vprintf always starts with the first argument in the variable argument list. It is possible to start output from any particular argument by issuing the appropriate number of va_arg calls before calling the vprintf function. Each va_arg call advances the position in the argument list by one argument. vprintf does not call the va_end macro. Since vprintf uses the va_arg macro, the value of arg is undefined on return. The following applies in the case of text files with SAM access mode and variable record length for which a maximum record length is also specified: When the specification split=no was entered for fopen, records which are longer than the maximum record length are truncated to the maximum record length when they are written. By default or with the specification split=yes, these records are split into multiple records. If a record has precisely the maximum record length, a record of the length zero is written after it.
Example See also	See under vfprintf vfprintf, vsprintf, vsnprintf