What will be the output of the following C++ code?

#include <iostream>
#include <stdarg.h>
using namespace std;
void fun(std::string msg, ...);
int main()
{
    fun("cPlusPlus", 1, 4, 7, 11, 0);
    return 0;
}
void fun(std::string msg, ...)
{
    va_list ptr;
    int num;
    va_start(ptr, msg);
    num = va_arg(ptr, int);
    num = va_arg(ptr, int);
    cout << num;
}