C++ (adaptable to C) program to determine the stack (memory) direction

stack_direction.cpp

#include<iostream>
using namespace std;
static int find_stack_direction ()
{
    static char *addr = 0;
    auto char dummy;
    if (addr == 0)
    {
        addr = &dummy;
        return find_stack_direction ();
    }
    else
    {
        return ((&dummy > addr) ? 1 : -1);
    }
}

int main() {
    int d = find_stack_direction();
    cout<<"stack direction: "<<((d == 1) ? "upwards":"downwards")<<"\n";
}