#include <stdarg.h>
        #include <reg51.h>
        #include <stdio.h>
             main() { 
                 void func(unsigned char, ...);
                 SCON=0x52; TMOD=0x20; TH1=0xf3; TR1=1;
                 func(1, 23, " John");
                 func(3, 23, " john", 20, " Henry", 25, " Tom");
               }
               void func(unsigned char n, ...) reentrant {
                 va_list ptr;
                 va_start(ptr, n);
                 while(n--)
                   printf("%4d %s\n", va_arg(ptr, int), va_arg(ptr, char *));
                 va_end(ptr);      
               }