the use of ... and its support macros va_arg, va_start, and va_end : function parameters « Function « C++ Tutorial

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3. function parameters

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

void vsmallest(char *message, ...);

int main()
{
 vsmallest("Print %d integers, %d %d %d",10,4,1);

 return(0);
}

void vsmallest(char *message, ...)
{
 int inumber_of_percent_ds=0;
 va_list type_for_ellipsis;
 int ipercent_d_format = 'd';
 char *pchar;
 pchar=strchr(message,ipercent_d_format);
  
 while(*++pchar != '\0') {
   pchar++;
   pchar=strchr(pchar,ipercent_d_format);
   inumber_of_percent_ds++;
 }
 printf("print %d integers,",inumber_of_percent_ds);

 va_start(type_for_ellipsis,message);

 while(inumber_of_percent_ds--)
   printf(" %d",va_arg(type_for_ellipsis,int));

 va_end(type_for_ellipsis);
}