Can you set a variables in a functions parent function (doable in C)?

[Pincus]

Hey,
I am not down with AS3. I know AS2. So I am wondering if it is possible to do something in AS3 which I cannot do in AS2, but it is possible in C.
I am wanting to basically do this:

function fu1():Void {
    var myNum:Number = 32;
    fu2();
    trace(myNum);
}

function fu2():Void {
    myNum = 64; // I want to change the myNum variable in fu1...
}

fu1(); // Output is 32, but I want to find a way for it to output 64. 

And in C:

#include <iostream.h>

void doStuff(int *abc) {
    *abc = 200;
}


int main() {
    int x = 10;
    doStuff(&x);
    printf("%i\n", x); // Outputs 200, not 10.
    system("pause");
    return 0;
} 

Hopefully you understand what I am asking.
Thanks in advance!