top = stock1.topval(stock2);

// 轻松使用c++

// 5. 面向对象 this指针， 面向对象的对象指针 完成

#include <iostream>

#include <string>

using namespace std;

class Over {

private:

public:

    int h = ;

};

class Stock {

private:

    /* data */

    int h;

public:

    Stock(int abc);

    ~Stock();

    int abc();

    Stock &topval(Stock &s);

    Stock &topval1(Over &s);

};

Stock::Stock(int abc) {

    h = abc;

    printf("%d\n", h);

}

Stock::~Stock() {

}

int Stock::abc() {

    this->h = ;

    printf("%d\n", this->h);

    printf("%d\n", h);

    return ;

}

Stock &Stock::topval(Stock &s) {

    printf("this-h: %d, s2.h: %d\n", this->h, s.h);

}

Stock &Stock::topval1(Over &s) {

    printf("this-h: %d, s2.h: %d\n", this->h, s.h);

}

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

    Stock s1();

    s1.abc();

    Stock s2();

    s1.topval(s2);

    Over s3;

    s1.topval1(s3);

    return ;

}