c++ 带参数构造全局变量实现方法

#include "stdafx.h"
#include <iostream>
#include <string>

class Test
{
public:
int a;
int b;

Test();
Test(int c);  // 带参数构造函数
~Test();
};

Test::Test(int c)
{
a = c;
}

Test * createTestObject()
{
Test *tmp = new Test(2);
return tmp;
}

Test * testmain; // 全局变量的定义
int _tmain(int argc, _TCHAR* argv[])
{
testmain = createTestObject();
std::cout << "get the result: " << testmain->a << std::endl;
system("PAUSE");
return 0;
}