INTERVIEW QUESTIONS C FUNCTIONS IN C DETAILS

Question: How can send unlimited no of arguments to a function, eg printf function can take any no of arguments

Answer: using va_list variables in stdarg.h headerfile

using va_list variables in stdarg.h headerfile Source: CoolInterview.com

Sending the unlimited number of arguments to a function can be done by "Variable number of arguments" concept in C.

These function definitions will contain an ellipse(...) which indicates the variable number of argument. example

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

void eprintf (const char *template, ...)
{
va_list ap;
extern char *program_invocation_short_name;

fprintf (stderr, "%s: ", program_invocation_short_name);
va_start (ap, template);
vfprintf (stderr, template, ap);
va_end (ap);
}

Here va_Start() initializes variable argument list pointer ap to the beginning of the variable argument list, before any calls to va_arg().

The va_arg() macro returns the next argument in the variable argument list pointed to by ap.


For a clear example refer :
http://www.linuxvalley.it/encyclopedia/ldp/manpage/man3/stdarg.3.php Source: CoolInterview.com

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