任务

修改如下代码中的错误

#include <iostream>

using namespace std;

class Test
{
public:
    Test(int a,int b):a(a),b(b){}
    
    void function(void)
    {
        a ++;
        b ++;
    }
    
    static void static_function(void)
    {
        a ++;
        b ++;
    }
    
    void show(void) 
    {
        cout << "a : " << a << endl;
        cout << "b : " << b << endl;
    }
    
    static void static_show(void)
    {
        show();
    }
    
private:
    int a;
    static int b;
};

int main(void)
{
    Test obj1(1,2);
    Test obj2(3,4);
    
    Test::function();
    Test::static_function();
    
    obj1.show();
    obj2.show();
    
    return 0;
}