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variable arguments in C

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variable arguments in C

Jul 13th, 2007

how can we pass variable arguments in any function of C?

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Re: variable arguments in C

Jul 13th, 2007

http://en.wikipedia.org/wiki/Stdarg.h

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Re: variable arguments in C

Jul 13th, 2007

I think this should work, but i didn't test it, please do it yourself.

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 C Syntax (Toggle Plain Text) 
#include <stdarg.h>
 
void stringstofile (FILE *filehandle, ...)
{
	va_list vargs;
 
	va_start (vargs, filehandle);
	while (va_arg (vargs, char *))
		fputs (va_arg (vargs, char *), filehandle);
	va_end (vargs);
}
#include <stdarg.h>

void stringstofile (FILE *filehandle, ...)
{
	va_list vargs;

	va_start (vargs, filehandle);
	while (va_arg (vargs, char *))
		fputs (va_arg (vargs, char *), filehandle);
	va_end (vargs);
}

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Re: variable arguments in C

Jul 13th, 2007

Google first....

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Re: variable arguments in C

Jul 16th, 2007

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Originally Posted by hitesh_mathpal

how can we pass variable arguments in any function of C?

Simply to answer your question.

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
 
int sum;
 
int main() {
 
sum = myfunction(5, 10);
 
}
 
int myfunction(int argument1, int argument2) {
 
      return argument1 + argument2;
 
}
#include <stdio.h>

int sum;

int main() {

sum = myfunction(5, 10);

}

int myfunction(int argument1, int argument2) {

      return argument1 + argument2;

}

Code not tested, but see no reason why it shouldn't work.

Cheers.

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Re: variable arguments in C

Jul 16th, 2007

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Originally Posted by dr4g

Code not tested, but see no reason why it shouldn't work.
Cheers.

Agree it should work but not the way the OP intended because it does not allow for variable number of arguments.

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Re: variable arguments in C

Jul 16th, 2007

1) What's the OP?

2) didn't want to over complicate things for the guy, as he seems to be just starting out in C, giving him a basic understanding of parameter passing would be more beneficial without talking to him about 'VA'.

That's my opinion anyway.

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Re: variable arguments in C

Jul 16th, 2007

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Originally Posted by dr4g

1) What's the OP?

2) didn't want to over complicate things for the guy, as he seems to be just starting out in C, giving him a basic understanding of parameter passing would be more beneficial without talking to him about 'VA'.

That's my opinion anyway.

OP = Original Poster. I thought OP was a pretty common term, but maybe I was wrong. That's what I get for using an anronym.

He asked for variable arguments -- the code you posted did nothing to answer that question. I don't know his experience and neither does anyone else. He must have at least some programming knowledge in order to even ask the question.

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Re: variable arguments in C

Jul 16th, 2007

Dear friend , I am asking about a function like printf(). as it takes the variable argument.How can we define a function like this?

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Re: variable arguments in C

#10

Jul 16th, 2007

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Originally Posted by Ancient Dragon

OP = Original Poster. I thought OP was a pretty common term, but maybe I was wrong. That's what I get for using an anronym.

He asked for variable arguments -- the code you posted did nothing to answer that question. I don't know his experience and neither does anyone else. He must have at least some programming knowledge in order to even ask the question.

Haha, i thought he ment passing variable arguments.. as you can pass an array as a parameter (using pointers of course), so i thought he ment how do you pass a variable to a function.

Oh well

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