C++初步，对象的初始化，构造方法的重载

#include<iostream>

using namespace std;

class test
{
    public:
        test();
        test(int i,int j);
        void put();
    private:
        int a;
        int b;
};

test::test()
{
    a=1;
    b=2;
}
test::test(int i,int j)
{
    a=i;
    b=j;
}

void test::put()
{
    cout<<b<<endl;
}

int main()
{
    test b(5,6);
    test *p=new test(7,0);
    test *q=new test();
    test k;
    p->put();
    q->put();
    b.put();
    k.put();
}