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Can anyone give me example of multiple arguments function?


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  #1  
Old March 12th, 2013, 09:08 AM
ashishpatel1992 ashishpatel1992 is offline
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Can anyone give me example of multiple arguments function?
Can anyone give me example of multiple arguments function?

Like
void display(int a,...);
For Example i would like to display the value of integer type variable by multiple arguments function.
Eg.


If i pass
Function: Output:-
display(2) --> 2
display(2,3,4) ---> 2 3 4

I want a single function that accepts multiple arguments. I know this is possible but dont know how?

Help Will be appreciated.
Thank you.
Regards,
Ashish
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  #2  
Old March 12th, 2013, 12:21 PM
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Look up "variadic functions." (varargs)
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Old March 12th, 2013, 12:28 PM
ashishpatel1992 ashishpatel1992 is offline
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Solution for Turboc3 Compiler?
I want solution for Turboc3 Compiler?
I tried putting void display(int x,...);
it accepts ... means there would be some solution.?
Can you post example for turboc?
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Old March 12th, 2013, 01:52 PM
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Dawei posted a perfectly good answer which works for TurboC 3 as well (I know it worked in TurboC 2.0 for sure). Have you tried googling for those terms + example.

Also, just so you know, TurboC compiler is outdated and you shouldn't be using it. Tell your teacher I said so.
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Old March 12th, 2013, 02:28 PM
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Are you asking about functions with variable numbers of arguments? Such as (from stdio.h):
Code:
/*
 * Formatted Output
 */

int	fprintf (FILE*, const char*, ...);
int	printf (const char*, ...);
int	sprintf (char*, const char*, ...);
int	_snprintf (char*, size_t, const char*, ...);
int	vfprintf (FILE*, const char*, va_list);
int	vprintf (const char*, va_list);
int	vsprintf (char*, const char*, va_list);
int	_vsnprintf (char*, size_t, const char*, va_list);

By the way, I doubt that you could get away with the notation for printf.

Or are you simply talking about functions with more than one argument? Such as (again from stdio.h):
Code:
/*
 * Direct Input and Output Functions
 */

size_t	fread (void*, size_t, size_t, FILE*);
size_t	fwrite (const void*, size_t, size_t, FILE*);

Though you should have been able to find that in your textbook. And in the documentation for the standard library functions.

Of course, those are function prototypes which only need to know what datatype each parameter is. When you write the function itself, you will need to give each parameter a name in addition to the datatype.
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Old March 12th, 2013, 02:37 PM
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I am talking with respect to int printf (const char*, ...);
Also I was looking for its implementation. If I could find it may be i could easily understand how it works & I could write my display function.
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Old March 12th, 2013, 03:00 PM
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click me here is the source to the working guts of printf. You'll easily understand it and be able to write your own display function.
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