#include
     
      using namespace std;class base1 {public:    base1(int m = 0, int n = 0) :m1(m), n1(n) {};    void setnumber1(int m0, int n0) {        m1 = m0;        n1 = n0;    };    int getnumber1() { return m1 + n1; };private:    int m1, n1;};class base2 {public:    base2(int m = 0, int n = 0) :m2(m), n2(n) {};    void setnumber2(int m0, int n0) {        m2 = m0;        n2 = n0;    };    int getnumber2() { return m2 - n2; };private:    int m2, n2;};class base3 {public:    base3(int m = 0, int n = 0) :m3(m), n3(n) {};    void setnumber3(int m0, int n0) {        m3 = m0;        n3 = n0;    };    int getnumber3() { return m3 * n3; };private:    int m3, n3;};class base4 {public:    base4(int m = 0, int n = 0) :m4(m), n4(n) {};    void setnumber4(int m0, int n0) {        m4 = m0;        n4 = n0;    };    double getnumber4() { return (double)m4 / n4; };private:    int m4, n4;};class A :public base1,public base2 {public:    A(int m=1, int n=1) :base1(m, n), base2(m, n) {};};class B :public base1,public base3 {public:    B(int m=1, int n=1) :base1(m, n), base3(m, n) {};};class C :public base1,public base4 {public:    C(int m=1, int n=1) :base1(m, n), base4(m, n) {};};int main() {    A a;    B b;    C c;    cout << a.getnumber2() << endl;    cout << b.getnumber3() <
     

 

#include
     
      using namespace std;class vehicle {public:    vehicle(int maxspeed0=0,int weight0=0):maxspeed(maxspeed0), weight(weight0){}    ~vehicle(){}    void run() {        cout << "run" << endl;    }    void stop() {        cout << "stop" << endl;    }private:    int maxspeed, weight;};class bicycle:virtual public vehicle {public:    bicycle(int maxspeed1 = 0, int weight1 =0, int height1 = 0) :vehicle(maxspeed1, weight1), height(height1){}    ~bicycle(){};private:    int height;};class motorcar :virtual public vehicle {public:    motorcar(int maxspeed2 = 0, int weight2 = 0, int seatnum2=0):vehicle(maxspeed2, weight2), seatnum(seatnum2){}    ~motorcar(){}private:    int seatnum;};class motorcycle :public bicycle, public motorcar {public:    motorcycle(int maxspeed3 = 0, int weight3 = 0, int height3 = 0,int seatnum3=0):bicycle(maxspeed3,weight3,height3),motorcar(maxspeed3,weight3,seatnum3){}    ~motorcycle(){}};int main() {    motorcycle M(6, 6, 6, 6);    M.run();    M.stop();    return 0;}
     

 fraction.h

#pragma onceclass Fraction {public:    Fraction();    Fraction(int top0, int bottom0);    Fraction(int top0);    void Compare(Fraction&f0);    void set_fraction();    void get_fraction();    Fraction operator+(const Fraction&f0)const;    Fraction operator-(const Fraction&f0)const;    Fraction operator*(const Fraction&f0)const;    Fraction operator/(const Fraction&f0)const;    ~Fraction();private:    int top;    int bottom;};

fraction.cpp

#include"Fraction.h"#include
     
      using namespace std;Fraction::Fraction() :top(0), bottom(1) {}Fraction::Fraction(int top0) : top(top0), bottom(1) {}Fraction::Fraction(int top0, int bottom0) : top(top0), bottom(bottom0) {}Fraction::~Fraction() {}void::Fraction::set_fraction() {    cin >> top >> bottom;}void::Fraction::get_fraction() {    cout << top << "/" << bottom << endl;}Fraction Fraction:: operator+(const Fraction&f0)const {    return Fraction(f0.top*bottom + top * f0.bottom, f0.bottom*bottom);}Fraction Fraction:: operator-(const Fraction&f0)const {    return Fraction(top * f0.bottom - f0.top*bottom, f0.bottom*bottom);}Fraction Fraction:: operator*(const Fraction&f0)const {    return Fraction(top * f0.top, f0.bottom*bottom);}Fraction Fraction:: operator/(const Fraction&f0)const {    return Fraction(top * f0.bottom, bottom * f0.top);}void::Fraction::Compare(Fraction&f0) {    if ((top * f0.bottom - f0.top*bottom)>0)        cout << top << "/" << bottom << ">" << f0.top << "/" << f0.bottom << endl;    else if ((top * f0.bottom - f0.top*bottom)<0)        cout << top << "/" << bottom << "<" << f0.top << "/" << f0.bottom << endl;    else        cout << top << "/" << bottom << "=" << f0.top << "/" << f0.bottom << endl;}
     

ifraction.h

#pragma once#include"fraction.h"class iFraction: public Fraction{public:    iFraction(int top, int bottom, int wnum) ;    void showiFraction() ;private:    int wnum;};

ifraction.cpp

#include"ifraction.h"#include
     
      using namespace std;iFraction::iFraction(int top0, int bottom0, int wnum0): Fraction(top0,bottom0),wnum(wnum0) {}void iFraction::showiFraction() {    cout << wnum<<" ";    get_fraction();}
     

main.cpp

#include"fraction.h"#include"ifraction.h"#include
     
      using namespace std;int main() {    Fraction f(1, 1);    Fraction f1(2, 2);    Fraction f3 = f1 + f;    iFraction f4(1, 2, 3);    f3.get_fraction();    f3 = f1 - f;    f3.get_fraction();    f3 = f1 * f;    f3.get_fraction();    f3 = f / f1;    f3.get_fraction();    f4.showiFraction();    return 0;}
     

 做第一二题没有注意要求分文件，加上这两题不是很复杂，就没有采用分文件。

在第三题时发现了一些问题，因为fraction.h需要被多次包含，就出现了了重复编译的问题，这时候就需要采用宏或者预编译头的方式来避免重复编译

还有一个问题我没有解决，本来我在fraction类中是定义了复制构造函数的，但是在重载运算符时，创建了临时无名对象作为返回值时，显示fraction类中没有合适的复制构造函数。后来我把自己定义的复制构造函数删除之后就没有问题了，没有想明白，不知道谁可以为我解答吗？