vprintf

Prints formatted output based on an argument list.

This function is the same as the printf function except that instead of being called with a variable number of arguments, it is called with an argument list that has been initialized by the va_start macro (and possibly with subsequent va_arg calls) from <stdarg.h>.

Format

#include  <stdio.h>

int vprintf  (const char *format, va_list arg);

Arguments

format

A pointer to the string containing the format specification. For more information about format and conversion specifications and their corresponding arguments, see Chapter 2.

arg

A variable list of the items needed for output.

Description

See Chapter 2 for information on format specifiers.

Return Values

x	The number of bytes written.
Negative value	Indicates an output error. The function sets errno. For a list of possible errno values set, see fprintf in this section.

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