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  • 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


    Category Functions in C Interview Questions
    Rating (0.4) By 1204 users
    Added on 7/19/2006
    Views 3671
    Rate it!
    Answers:

    using va_list variables in stdarg.h headerfile



    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



    Posted by: Syed Baseer Ahmed    

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