Hi all,
What is elipsis operator in C and Can any one explain, at which situation we have to use elipsis operator in C.

__________________
Regards,
VELHARI
I am not totally useless. I can be used for a bad example

using elipsis operator... u can pass any number of parameters ..... you can see this stdio.h file .... printf(), scanf () , functions uses this operator....

Hi connect2Sathya,

Thanks for your reply.... i understood that we can pass as many no of argument to a function which uses elipsis operator.

So, i did my stuff here... but in this i have one problem
let me explain that problem with the following scenario..

I am using that elipsis operator to find out the greatest number.

Code:

#include <stdio.h>
void main()
{
        int greater;
        greater = find_greatest(5,1,9,2,7,4,6,1,0,18,59,37);
        printf("Greatest Number is %d",greater);
}
int find_greatest( val,...)
{
      //my stuff here
}

from here i got a problem. In that above said function find_greatest. I used the elipsis operator and passing multiple arguments from main.

In that function, for doing my stuff to calculate greatest no.. i have to know how many no of argument is passed from called function then only i have to start calculation for to finding the greatest no... for this how can i get the no of parameter is passed from the calling function and how to access that arguments in the calling function.....

Please help me to acheive this....

__________________
Regards,
VELHARI
I am not totally useless. I can be used for a bad example

Hi all,

Finally i found the solution for the above problem.
The following Macros are used for to get the argument values by using elipsis operator.

va_list
A Pointer Data Type
va_start()
A Macro Used to Initialize the argument list
va_arg()
A Macro Used to retreive each argument,in turn, from the variable list
va_end()
A Macro Used to “clean up” when all arguments have been retrieved

Code:

#include<stdio.h>
void main()
{
	int greater;
	greater = find_greatest(6, 1,2,50,35,12,90);
	printf("Greatest Number is %d", greater);
	getch();
}
int find_greatest(int num, ...)
{
	int vLoop=0;
	/* Declare a variable of type va_list. */
	va_list Args;
	/* Initialize the argument pointer. */
	va_start(Args, num);
	/* Retrieve each argument in the variable list. */
	Max = va_arg(Args, int);
	for ( vLoop=1; vLoop<num; vLoop++ )
	{
		Temp = va_arg(Args, int)
		if ( Max < Temp)
			Max = Temp;
	}
	/* Perform clean up. */
	va_end(Args);
	
	return Max;
}

__________________
Regards,
VELHARI
I am not totally useless. I can be used for a bad example