Write formatted output to stdout.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <stdio.h>

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

Parameters for this facility are:

format	const char *	The format string
arg	va_list	A variable argument list

The vprintf() function works identically to the printf() function. Instead of the variable list of arguments that can be passed to printf(), vprintf() accepts its arguments in the array of type va_list processed by the va_start() macro from the stdarg.h header file.

For specifications concerning the output control string and conversion specifiers please see: "Output Control String and Conversion Specifiers."

vprintf() returns the number of characters written or a negative value if it failed.

"Wide Character and Byte Character Stream Orientation"

"fprintf"

"printf"

"Overview of stdarg.h"

#include <stdio.h>
#include <stdarg.h>

int pr(char *, ...);

int main(void)
{
	int a = 56;
	double f = 483.582;
	static char s[] = "Metrowerks";

	// output a variable number of arguments to stdout
	pr("%15s %4.4f %-10d*\n", s, f, a);

	return 0;

}

// pr() formats and outputs a variable number of arguments
// to stdout using the vprintf() function
int pr(char *format, ...)
{
	va_list args;
	int retval;
	va_start(args, format); // prepare the arguments
	retval = vprintf(format, args);
	va_end(args);				// clean the stack
	return retval;
}
Output:
Metrowerks 483.5820 56        *





[ First ]  [ Previous ]  [ Next ]  [ Last ]  [ Manuals ]







Visit the Metrowerks website at: http://www.metrowerks.com


For assistance contact Metrowerks Technical Support at: cw_support@metrowerks.com


Copyright © 2000, Metrowerks Corp. All rights reserved.





Last updated: August 16, 2000