C Programming - Variable Number of Arguments - Discussion

#include<stdio.h>
#include<stdarg.h>
void fun(char *msg, ...);

int main()
{
    fun("IndiaBIX", 1, 4, 7, 11, 0);
    return 0;
}
void fun(char *msg, ...)
{
    va_list ptr;
    int num;
    va_start(ptr, msg);
    num = va_arg(ptr, int);
    num = va_arg(ptr, int);
    printf("%d", num);
}