实验6，继承

//7.1#include<iostream>
using namespace std;
class Total{
    public:
        Total(int i,int j){
            cout<<"* constructor is called"<<endl;
            n=i;
            m=j;
        }
        Total(){
            cout<<"* constructor is called"<<endl;
            n=0;
            m=0;
        }
        Total(Total &total){
            cout<<"* copy constructor is called"<<endl;
            n=total.n;
            m=total.m;
        }
        int add(){
            return n+m;
        }
        ~Total() {cout<<"* destructor is called"<<endl;}
    private:
        int n;
        int m;
};
class A: public Total{
    private:
        int n;
        int m;
    public:
        A(int a,int b): Total(a,b),n(a),m(b) {cout<<"A constructor is called"<<endl;};
        A():Total(0,0),n(0),m(0) {cout<<"A constructor is called"<<endl;};
        int subtract(){
            return n-m;
        }
        ~A(){cout<<"A destructor is called"<<endl;}
};
class B: public Total{
    private:
        int n;
        int m;
    public:
        B(int a,int b): Total(a,b),n(a),m(b) {cout<<"B constructor is called"<<endl;};
        B():Total(0,0),n(0),m(0) {cout<<"B constructor is called"<<endl;};
        int multiply(){
            return n*m;
        }
        ~B(){cout<<"B destructor is called"<<endl;}
};
class C: public Total{
    private:
        int n;
        int m;
    public:
        C(int a,int b): Total(a,b),n(a),m(b) {cout<<"C constructor is called"<<endl;};
        C():Total(0,0),n(0),m(0) {cout<<"C constructor is called"<<endl;};
        int divide(){
            return n/m;
        }
        ~C(){cout<<"C destructor is called"<<endl;}
};
int main()
{
    int m,n;
    cout<<"make sure of the value of m and n"<<endl;
    cin>>m>>n;
    A a(m,n);
    B b(m,n);
    C c(m,n);
    cout<<"m + n =";
    cout<<a.add()<<endl;
    cout<<"m - n ="<<a.subtract()<<endl;
    cout<<"m * n ="<<b.multiply()<<endl;
    cout<<"m / n ="<<c.divide()<<endl;
    return 0;
}

//7.2#include<iostream>
using namespace std;
class vehicle{
    public:
        vehicle(int i,int j) : maxspeed(i) , weight(j){cout<<"vehicle‘s constructor is called"<<endl;}
        vehicle() : maxspeed(0) , weight(0){cout<<"vehicle‘s constructor is called"<<endl;}
        void initvehicle(int n,int m){maxspeed=n;weight=n;}
        void run(){
            cout<<"the vehicle‘s weight is "<<weight<<endl;
            cout<<"the vehicle‘s speed is "<<maxspeed<<endl;
        }
        void stop(){
            cout<<"the vehicle has stopped "<<endl;
        }
        ~vehicle(){cout<<"vehicle‘s destructor is called"<<endl;}
    protected:
        int maxspeed;
        int weight;
};
class bicycle:virtual public vehicle{
    public:
        bicycle(int i,int j,int k):vehicle(i,j),height(k){cout<<"the vehicle(bicycle)‘s constructor is called"<<endl;}
        bicycle():vehicle(0,0),height(0){cout<<"the vehicle(bicycle)‘s constructor is called"<<endl;}
        void initbicycle(int n){height=n;}
        ~bicycle(){cout<<"vehicle(bicycle)‘s destructor is called"<<endl;}
    protected:
         int height;
};
class motorcar:virtual public vehicle{
    public:
        motorcar(int i,int j,int k):vehicle(i,j),seatnum(k){cout<<"the vehicle(motorcar)‘s constructor is called"<<endl;}
        motorcar():vehicle(0,0),seatnum(0){cout<<"the vehicle(motorcar)‘s constructor is called"<<endl;}
        void initmotorcar(int n){seatnum=n;}
        ~motorcar(){cout<<"vehicle(motorcar)‘s destructor is called"<<endl;}
    protected:
        int seatnum;
};
class motorcycle:public bicycle,public motorcar{
    public:
    motorcycle(int i,int j,int k,int p):vehicle(i,j),bicycle(i,j,k),motorcar(i,j,p){cout<<"the vehicle(motorcycle)‘s constructor is called"<<endl;}
    motorcycle():vehicle(),bicycle(),motorcar(){cout<<"the vehicle(motorcycle)‘s constructor is called"<<endl;}
    ~motorcycle(){cout<<"vehicle(motorcycle)‘s destructor is called"<<endl;}
};
int main(){
    int m,n,p,q;
    cout<<"please decide your vehicle‘s maxspeed and weight:"<<endl;
    cin>>m>>n;
    cout<<"please decide your motorcar‘s height and seatnum:"<<endl;
    cin>>p>>q;
    motorcycle mc(m,n,p,q);
    system("pause");
    mc.run();
    system("pause");
    mc.stop();
    system("pause");
    return 0;
}

//7.3 代码大部分见上次fraction类

//main中添加代码
system("pause");
        cout<<"about ifraction---------------"<<endl;
    cout<<"make sure of the times2:"<<endl;
    int times2;
    cin>>times2;
    while(times2--){
        int p,q;
        cout<<"please make sure of the top and bottom of the fraction: "<<endl;
        cin>>p>>q;
        iFraction ifraction(p,q);
        ifraction.legal();
        convertF(ifraction);
        ifraction.print();

//iFraction类
class iFraction :public Fraction{
    public:
        iFraction(int n,int m):Fraction(n,m),wholepart(0),fractionparttop(0),fractionpartbottom(0){}
        ~iFraction(){}
        friend void convertF(iFraction &A);
        void print();
    private:
        int wholepart;
        int fractionparttop;
        int fractionpartbottom;
};
//ifraction 实现
#include<iostream>
#include"ifraction.h"
using namespace std;
void convertF(iFraction &A){
    int i;
    i=A.top;
    int j;
    j=A.bottom;
    if(i>0){
        A.wholepart=i/j;
        A.fractionparttop=i-A.wholepart*j;
        A.fractionpartbottom=j;
    }
    if(i<0){
        i=-1*i;
        A.wholepart=i/j;
        A.fractionparttop=i-A.wholepart*j;
        A.fractionpartbottom=j;
        A.wholepart=-1*A.wholepart;
    }
}

void iFraction::print(){
    if(wholepart!=0)
        cout<<wholepart<<" ("<<fractionparttop<<"/"<<fractionpartbottom<<")"<<endl;
    else
        cout<<fractionparttop<<"/"<<fractionpartbottom<<endl;
}

原文地址：https://www.cnblogs.com/tacore/p/9148140.html