Miscellaneous – X – Variable Arguments.

Header File  <stdarg.h> provide Macros that implement variable argument lists.

void va_start(va_list ap, lastfix);

type va_arg(va_list ap, type);

void va_end(va_list ap);

The va_arg, va_end, and va_start macros provide a portable way to access these

argument lists.

va_start sets ap to point to the first of the variable arguments being passed to the function.

va_arg expands to an expression that has the same type and value as the next argument being passed .

Because of default promotions, you can't use char, unsigned char, or float types with va_arg.

va_end helps the called function perform a normal return.

---

#include <stdio.h>

#include <stdarg.h> //Header file for variable argument

  int Addition( int num, ... )

      {

           va_list args;   // Variable to store the arguments

           int sum = 0,i;

           va_start ( args, num );           // Initializing arguments

           for (i=0;i<num;i++)        // Loop until all no of args

                   sum += va_arg ( args, int ); // Adds

           va_end ( args );                  // Clear the list

           return sum;                      // Returns the average

      }

  void main()

      {

           printf("%d",Addition ( 3, 12, 22, 40 ));

      }

---

#include <stdio.h>

#include <stdarg.h> //Header file for variable argument

  void PrintChar(char *ch, ...)

      {

           va_list argc;

           char arg;

           va_start(ap, msg);

           while ((arg = va_arg(argc,char)) !='0')

              {

                   printf("%c ",arg);

              }

           va_end(ap);

      }

  void main()

      {

           clrscr();

           PrintChar("The Character %c\n", 'a','b','c','d','0');

           getch();

      }