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function parameters

Started by Redoc Apr 28, 2003 at 10:11 PM 2 replies 300+ views

Original Post

Apr 28, 2003 at 10:11 PM

Hello! To start with, Im playing with new things when it comes to functions (such as function pointers etc) and I would like to know how to get the parameters passed to a function when I do this: void Test(int x, ...) { } I call my test function with: Test(10, 20, 30, "hi"); But I only know that x is 10. How do I access the other variables? What is the name used for "..."? Sorry for posting this, I would have searched... but I dont know what to search for

Thanks

Russell

Apr 28, 2003 at 10:47 PM

This is an example from an open source chess program that I have read in the past that uses it. Search for the va_ functions on the net, or look them up in a reference book. You need to include stdarg.h I believe. This function below basically is just a printf() wrapper. In the program, it needed fflush() to be called after each outputs, so the author chose to do it like this.

  
void VSendToWinboard(const char * szFmt, ...)
{
	char	aszBuf[1024];
	va_list	lpArgPtr;

	va_start(lpArgPtr, szFmt);
	vsprintf(aszBuf, szFmt, lpArgPtr);
	printf("%s\n", aszBuf);
	fflush(stdout);
}
[/quote]

Jan Wassenberg

105

Jan Wassenberg

Apr 29, 2003 at 2:17 AM

Did the author not know about setvbuf(stdout, NULL, _IONBF, 0), or does that not work for some reason? (I haven''t tried it)

Kuladus

106

Kuladus

Apr 29, 2003 at 4:23 AM

yep use the std variable arguments library function

#include <stdarg.h>

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