新线程运行问题

#include <iostream>
#include <windows.h>

// 线程函数
DWORD WINAPI ThreadProc(LPVOID lpParam)
{
for(int i = 0; i != 20; ++i)
{
std::cout << " I am from a thread, count = " << i << std::endl;
}
return 0;
}

int main(int argc, char* argv[])
{
HANDLE hThread;
DWORD dwThreadId;

// 创建一个线程
hThread = ::CreateThread (
NULL, // 默认安全属性
NULL, // 默认堆栈大小
ThreadProc, // 线程入口地址（执行线程的函数）
NULL, // 传给函数的参数
0, // 指定线程立即运行
&dwThreadId); // 返回线程的ID号
std::cout << " Now another thread has been created. ID = " << dwThreadId << std::endl;

// 等待新线程运行结束
::WaitForSingleObject (hThread, INFINITE);
::CloseHandle (hThread);
return 0;
}

VS2008编译运行结果
 Now another thread has been created. ID = I am from a thread, count = 23680

 I am from a thread, count = 1
 I am from a thread, count = 2
 I am from a thread, count = 3
 I am from a thread, count = 4
 I am from a thread, count = 5
 I am from a thread, count = 6
 I am from a thread, count = 7
 I am from a thread, count = 8
 I am from a thread, count = 9
 I am from a thread, count = 10
 I am from a thread, count = 11
 I am from a thread, count = 12
 I am from a thread, count = 13
 I am from a thread, count = 14
 I am from a thread, count = 15
 I am from a thread, count = 16
 I am from a thread, count = 17
 I am from a thread, count = 18
 I am from a thread, count = 19
请按任意键继续. . .

以上代码为什么没输出"i = 0"?

新手求教!

楼主需要++i和i++区别！