Threaded Program to compute Fibonacci numbers

I'm trying to write a program in C++ to compute the Fibonacci series. I create a thread that does the calculation and output. But nothing in my for loop seems to get executed. Can anyone have a look at my code and tell me what I might be doing wrong?

#include <iostream>
#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>

using namespace std; 

//iterative with output
DWORD WINAPI fib3(LPVOID param){
double u = 0; 
double v = 1;
double t; 
int upper = *(int*)param;

for(int i = 2; i <= upper; i++){
    cout << v << " "; 
    t = u + v; 
    u = v; 
    v = t; 
    cout << "testing" << endl; 
}
    cout << v << " "; 
    return 0; 
}

int main(int argc, char *argv[]){

cout << "This will compute the fibonacci series.\n" << endl; 
bool done = true; 
double x; 
DWORD ThreadId; 
HANDLE ThreadHandle; 

while(done){

    cout << "Enter a number: "; 
    c开发者_开发知识库in >> x;

    if(x == -1){
        cout << "\nExiting" << endl; 
        return 0; 
    }

    ThreadHandle = CreateThread(NULL, 0, fib3, &x, 0, &ThreadId); 

    if(ThreadHandle != NULL){
        WaitForSingleObject(ThreadHandle, INFINITE); 

        CloseHandle(ThreadHandle); 
    }

}

return 0; 
}

You're passing the address of a double to CreateThread, then you try to treat it as an int * in the thread func. Change double x; to int x;