一。實驗結論：

1.（1）類的聲明：

#include<iostream> using namespace std; class A {public:A(int m,int n);void plus();void minus();protected:int a;int b; }; class B:public A {public:B(int m,int n):A(m,n){}void multi(); }; class C:public A {public:C(int m,int n):A(m,n){}void divi(); };

（2）類的實現：

#include"math.h" #include<iostream> using namespace std; A::A(int m,int n) {a=m;b=n; } void A::plus() {int p;p=a+b;cout<<"The result is:"<<p<<endl; } void A::minus() {int p;p=a-b;cout<<"The result is:"<<p<<endl; } void B::multi() {int p;p=a*b;cout<<"The result is:"<<p<<endl; } void C::divi() {double p;if(b==0)cout<<"Error!"<<endl;else{p=(double)a/(double)b;cout<<"The result is:"<<p<<endl;} }

（3）主函數：

#include<iostream> #include"math.h" using namespace std; int main() {int m,n;char p;while(1){cout<<"Please input an equation, input 000 to exit:";cin>>m>>p>>n;if(m==0&&p=='0'&&n==0)break;else{if(p=='+'){A a(m,n);B b(m,n);C c(m,n);a.plus();b.plus();c.plus();}else if(p=='-'){A a(m,n);a.minus();}else if(p=='*'){B a(m,n);a.multi();}else if(p=='/'){C a(m,n);a.divi();}else{cout<<"Error!"<<endl;continue;}}}return 0; }

（4）運行結果：

2.（1）代碼：

#include<iostream> using namespace std; class vehicle {public:vehicle(int m,int w):maxspeed(m),weight(w){cout<<"Vehicle is constructing..."<<endl;cout<<"The max speed is:"<<maxspeed<<endl;cout<<"The weight is:"<<weight<<endl;}void run(){cout<<"Running..."<<endl;}void stop(){cout<<"Stopped."<<endl;}~vehicle(){cout<<"Vehicle has been destructed."<<endl;}protected:int maxspeed;int weight; }; class bicycle:virtual public vehicle {public:bicycle(int m,int w,int h):vehicle(m,w),height(h){cout<<"Bicycle is constructing..."<<endl;cout<<"The height is:"<<height<<endl;}~bicycle(){cout<<"Bicycle has been destructed."<<endl;}protected:int height; }; class motorcar:virtual public vehicle {public:motorcar(int m,int w,int s):vehicle(m,w),seatnum(s){cout<<"Motorcar is constructing..."<<endl;cout<<"The seatnum is:"<<seatnum<<endl;}~motorcar(){cout<<"Motorcar has been destructed."<<endl;}protected:int seatnum; }; class motorbike:public bicycle,public motorcar {public:motorbike(int m,int w,int h,int s):vehicle(m,w),bicycle(m,w,h),motorcar(m,w,s){}~motorbike(){cout<<"Motorbike has been destructed."<<endl;} }; int main() {int a,b,c,d;cout<<"Please input the maxspeed,weight,height,seatnum of the motorbike:";cin>>a>>b>>c>>d;motorbike M(a,b,c,d);M.run();M.stop();return 0; }

（2）運行結果：

3.（1）類的聲明：

//#include"Fraction.h" #include<iostream> using namespace std; class iFraction:public Fraction {public:iFraction(int p=0,int q=1,int n=0):Fraction(p,q),number(n){}void show();private:int itop;int ibottom;int number; };

（2）類的實現：

#include"iFraction.h" #include<iostream> using namespace std; void iFraction::show() {if(bottom==0)cout<<"Error!"<<endl;else if(top==0)cout<<number<<endl;else if(top%bottom==0){number=number+top/bottom;cout<<number<<endl;}else if(top>bottom){number=number+top/bottom;top=top%bottom;cout<<" "<<top<<endl;cout<<number<<"------"<<endl;cout<<" "<<bottom<<endl;}else if(number==0){cout<<" "<<top<<endl;cout<<"------"<<endl;cout<<" "<<bottom<<endl;}else{cout<<" "<<top<<endl;cout<<number<<"------"<<endl;cout<<" "<<bottom<<endl;} }

（3）主函數

#include"Fraction.h" #include"iFraction.h" #include<iostream> #include<stdlib.h> using namespace std; int main() {int x,y,z;Fraction a;a.output();Fraction b(3,6);b.output();Fraction c(5);c.output();b.compare(c);cout<<"Please input the top and the bottom:";cin>>x>>y;Fraction d(x,y);d.opera(x,y);d.output();cout<<"Please input a number:";cin>>z;iFraction e(x,y,z);e.opera(x,y);e.show();return 0; }

（4）運行結果：

二。實驗分析與討論

　　實驗第三題類的聲明中，有時取消第一行的注釋后編譯成功，而有時注釋第一行后編譯成功，至于什么原因我也沒有搞明白，麻煩大佬們在評論時幫我解答一下。。。。

　　通過這次實驗，我初步掌握了最近的新知識繼承與多態的大致概念以及使用方法，也發現了自己在所學知識的掌握方面的諸多不足，在以后的時間里，我還需要多加練習。

轉載于:https://www.cnblogs.com/manganese123/p/9141450.html

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