C++ 面向对象编程_实验报告1

C++ 实验一：类和对象的定义及使用

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实验题目 1

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
using namespace std;
class BookCard
{
private:
    string id;      //借书证学生的学号
    string stuName; //借书证学生的姓名
    int number;     //所借书的数量
public:
    BookCard(string Id, string StuName, int Num);
    BookCard();
    void display(); //显示借书证的3 个数据成员的信息
    bool borrow();  //已借书数量不足10 则将数量加1，数量达到10 则直接返回false
};

BookCard::BookCard(string Id, string StuName, int Num)
{
    id = Id;
    stuName = StuName;
    number = Num;
}
BookCard::BookCard()
{
    id = "B19010250";
    stuName = "雪峰";
    number = 4;
}
void BookCard::display()
{
    cout << id <<' '<< stuName <<' '<< number << endl;
}
bool BookCard::borrow()
{
    if (number / 10)
    {
        return false;
    }
    else
    {
        number++;
        return true;
    }
}

void f(BookCard &bk)
{
    if (!bk.borrow())
    {
        bk.display();
        cout << "you have borrowed 10 books,can not borrow any more!" << endl;
    }
    else
        bk.display();
}
int main()
{
    BookCard bk1("B20190620", "东平", 10), bk2;
    f(bk1);
    f(bk2);
    return 0;
}

实验题目2

这题主函数部分比较开放，可以任意发挥。
（数据也是我瞎编的，可以随便改~）

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
using namespace std;
class Time
{
private:
    int Hour;
    int Minute;
    int Second;
public:
    Time(int H, int M, int S);
    Time(const Time &t);
    ~Time();
    void IncreaceOneSecond( );
    void SettingTime(int H, int M, int S);
    void PrintTime();
};
Time::Time(const Time &t)
{
    Hour = t.Hour;
    Minute = t.Minute;
    Second = t.Second;
}

Time::Time(int H = 0, int M = 0, int S = 0)
{
    Hour = H;
    Minute = M;
    Second = S;
}

Time::~Time()
{
}
void Time::IncreaceOneSecond()
{
    if (Second < 59)
        Second++;
    else if (Minute < 59)
    {
        Second = 0;
        Minute++;
    }
    else if (Hour < 23)
    {
        Second = Minute = 0;
        Hour++;
    }
    else
    {
        Second = Minute = Hour = 0;
    }
}
void Time::PrintTime()
{
    cout << Hour << " : " << Minute << " : " << Second << endl;
}
void Time::SettingTime(int H, int M, int S)
{
    Hour = H;
    Minute = M;
    Second = S;
}
void f(Time *t)
{
    t->PrintTime();
}
int main()
{
    Time t0(23, 59, 58);
    t0.IncreaceOneSecond();
    f(&t0);
    Time t1 = t0;
    t1.IncreaceOneSecond();
    f(&t1);
    t0.SettingTime(5,2,0);
    f(&t0);
    return 0;
}

实验题目 3

同上，主函数可任意发挥啦

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
using namespace std;
class Girl;
class Boy
{
private:
    string name;
    int age;

public:
    Boy(string, int);
    ~Boy();
    friend void VisitBoyGirl(Boy &B, Girl &G);
};
Boy::Boy(string n = "None", int a = 0)
{
    name = n;
    age = a;
}
Boy::~Boy()
{
}
class Girl
{
private:
    string name;
    int age;

public:
    Girl(string n, int a);
    ~Girl();
    friend void VisitBoyGirl(Boy &B, Girl &G);
};
Girl::Girl(string n = "None", int a = 0)
{
    name = n;
    age = a;
}
Girl::~Girl()
{
}
void VisitBoyGirl(Boy &B, Girl &G)
{
    cout << "Boy:" << B.name << " " << B.age << endl;
    cout << "Girl:" << G.name << " " << G.age << endl;
}
int main()
{
    Boy b("Bob",16);
    Girl g("Alice",18);
    VisitBoyGirl(b, g);
    return 0;
}

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