实验6继承和多态

Posted 2020-11-11 werol714

 

 

实验1：

A.h

#ifndef A_H
#define A_H
#include"base.h"

class A:public Base{
public:
    A(int m,int n):Base(m,n){};
    int sub(int m,int n){return m-n;};
};

#endif

 

B.h

#ifndef B_H
#define B_H
#include"base.h"

class B:public Base{
public:
    B(int m,int n):Base(m,n){};
    int mul(int m,int n){return m*n;};
};

#endif

‘

C.h

#ifndef C_H
#define C_H
#include"base.h"

class C:public Base{
public:
    C(int m,int n):Base(m,n){};
    int div(int m,int n){return m/n;};
};

#endif

 

Base.h

#ifndef BASE_H
#define BASE_H

class Base{
public:
    Base(int a,int b):m(a),n(b){};
    int add(int m,int n){return m+n;};
protected:
    int m;
    int n;
};
#endif

 

main.cpp

#include<iostream>
#include"A.h"
#include"B.h"
#include"C.h"

using namespace std;

int main(){
    int m,n;
    cout << "请输入整数m和n：";
    cin >> m >> n;
    A a(m,n);
    B b(m,n);
    C c(m,n);
    cout << "m + n = " << a.add(m,n) << endl;
    cout << "m - n = " << a.sub(m,n) << endl;
    cout << "m * n = " << b.mul(m,n) << endl;
    cout << "m / n = " << c.div(m,n) << endl;

    return 0;

}

 

截图：

 

实验2：

vehicle.h

#ifndef VEHICLE_H
#define VEHICLE_H


class vehicle{
public:
    vehicle(int m,int w);
    ~vehicle();
    void run();
    void stop();
    int showMaxspeed();
    int showWeight();
private:
    int maxspeed;
    int weight;
};

#endif

 

vehicle.cpp

#include<iostream>
#include"vehicle.h"

using namespace std;

vehicle::vehicle(int m,int w):maxspeed(m),weight(w){
    cout << "constructing vehicle..." << endl;
}
vehicle::~vehicle(){
    cout << "destructing vehicle..." << endl;
}
void vehicle::run(){cout << "Run." <<endl;}
void vehicle::stop(){cout << "Stop." <<endl;}
int vehicle::showMaxspeed(){return maxspeed;}
int vehicle::showWeight(){return weight;}

 

bicycle.h

#ifndef BICYCLE_H
#define BICYCLE_H
#include"vehicle.h"

class bicycle:virtual public vehicle{
public:
    bicycle(int h,int m,int w);
    ~bicycle();
    int showHeight();
private:
    int height;
};

#endif

 

bicycle.cpp

#include<iostream>
#include"bicycle.h"

using namespace std;

bicycle::bicycle(int h,int m,int w):height(h),vehicle(m,w){
    cout << "constructing bicycle..." << endl;
}
bicycle::~bicycle(){
    cout << "destructing bicycle..." << endl;
}
int bicycle::showHeight(){return height;}

 

motorcar.h

#ifndef MOTORCAR_H
#define MOTORCAR_H
#include"vehicle.h"

class motorcar:virtual public vehicle{
public:
    motorcar(int s,int m,int w);
    ~motorcar();
    int showSeatnum(){return seatnum;}; 
private:
    int seatnum;
};

#endif

 

motorcar.cpp

#include<iostream>
#include"motorcar.h"

using namespace std;

motorcar::motorcar(int s,int m,int w):seatnum(s),vehicle(m,w){
    cout << "constructing motorcar..." << endl;
}
motorcar::~motorcar(){
    cout << "destructing motorcar..." << endl;
}

 

motorcycle.h

#ifndef MOTORCYCLE_H
#define MOTORCYCLE_H
#include"motorcar.h"
#include"bicycle.h"

class motorcycle:public bicycle,public motorcar{
public:
    motorcycle(int h,int s,int m,int w);
    ~motorcycle();
};

#endif

 

motorcycle.cpp

#include<iostream>
#include"motorcycle.h"

using namespace std;

motorcycle::motorcycle(int h,int s,int m,int w):bicycle(h,m,w),motorcar(s,m,w),vehicle(m,w){
    cout << "constructing motorcycle..." <<endl;
}
motorcycle::~motorcycle(){
    cout << "destructing motorcycle..." << endl;
}

 

main.cpp

#include<iostream>
#include"motorcycle.h"

using namespace std;

int main(){
    int h,s,m,w;
    motorcycle a(h,s,m,w);
    a.run();
    a.stop();
    return 0;
}

 

截图：

 

实验3：

faction.h

#ifndef FACTION_H
#define FACTION_H

class Faction
{
    public:
        Faction();                           //构造函数 
        Faction(int t0);                     //构造函数的重载 
        Faction(int t0,int b0);              //构造函数的重载 
        void compare(Faction &f2);           //比较大小函数 
        void show();                         //输出函数 
        int GetTop();                        //获取分子 
        int GetBottom();                     //获取分母 
        Faction operator+(Faction &f0);      //重载+ 
        Faction operator-(Faction &f0);      //重载- 
        Faction operator*(Faction &f0);      //重载* 
        Faction operator/(Faction &f0);      //重载/ 
    private:
        int top;     //分子 
        int bottom;     //分母 
};

#endif

 

faction.cpp

#include "Faction.h"
#include <iostream>
using namespace std;

//构造函数 
Faction::Faction():top(0), bottom(1) {
}

//构造函数的重载        
Faction::Faction(int t0):top(t0), bottom(1) {
}

//构造函数的重载        
Faction::Faction(int t0,int b0):top(t0), bottom(b0){
}

//输出函数
void Faction::show(){
    cout << top << "/" << bottom <<endl;
} 

Faction Faction::operator+(Faction &f0) {   //重载+
    Faction f;
    f.top = top *f0.bottom + f0.top*bottom;
    f.bottom = bottom*f0.bottom;
    return f;
}
Faction Faction::operator-(Faction &f0) {    //重载-
    Faction f;
    f.top = top *f0.bottom - f0.top*bottom;
    f.bottom = bottom*f0.bottom;         
    return f;
}
Faction Faction::operator*(Faction &f0) {    //重载*
    Faction f;
    f.top *= f0.top;
    f.bottom *= f0.bottom;
    return f;
}
Faction Faction::operator/(Faction &f0) {    //重载/  
    Faction f;
    f.top *= f0.bottom;
    f.bottom *= f0.top;
    return f;
}

//比较大小函数
void Faction::compare(Faction &f1) {
    Faction f2;
    f2.top = top * f1.bottom - f1.top*bottom;
    f2.bottom = bottom * f1.bottom;
    if(f2.bottom*f2.top > 0){
        cout << top << "/" << bottom << ">" << f1.top << "/" << f1.bottom <<endl;
    }
    else {
        cout << top << "/" << bottom << "<=" << f1.top << "/" << f1.bottom <<endl;
    }
}

int Faction::GetTop(){
    return top;
}
int Faction::GetBottom(){
    return bottom;
}

 

ifaction.h

#include "Faction.h"
#include <iostream>
using namespace std;

class iFaction:public Faction{
    public:
    iFaction(int t,int b):Faction(t,b){};
    iFaction(int t):Faction(t,1){};
    iFaction():Faction(0,1){};
    void ishow(){
        int a = GetBottom(); //a是最大公约数 
        int t0 = GetTop();
        int b0 = GetBottom();
        int t = GetTop();
        int b = GetBottom();
        while (t0 % b0 != 0){
            a = t0% b0;
            t0 = b0;
            b0 = a;
        }
        b/=a;
        t/=a;
        if (b == 0) {
            cout << "分母不得为0！" << endl;
        }
        else if (t == 0) {
            cout << t << endl;
        }
        else if ( t < b ) {
            cout << t << "/" << b << endl;
        }
        else {
            int nu = 0; //计算系数 
            while ( t > 0 ){
                t -= b;
                nu++;
            }
            cout << b << "(" << t+b << "/" << b << ")" <<endl;
        }        
    };

 

main.cpp

#include <iostream>
#include "iFaction.h"

using namespace std;

int main() {
    iFaction a;
    iFaction b(18,16);
    iFaction c(5);
    iFaction d;
    cout << "有以下三个分数：" << endl; 
    a.ishow();
    b.ishow();
    c.ishow();
    d = b + c;
    cout << "b + c =" ;
    d.show();
    d = b - c;
    cout << "b - c =" ;
    d.show();
    d = b * c;
    cout << "b * c =" ;
    d.show();
    d = b / c;
    cout << "b / c =" ;
    d.show();
    cout << "b与c大小关系为：";
    b.compare(c);
    return 0;
}

 这个报错说using namespace std;那一行错了，我不太懂……把派生类删了也是那个地方报错。