C++程序设计实践指导书12

C++程序设计实践上机指导书（第十二次）专业班级学号姓名信息学院PAGEPAGE7实践成绩评价说明（10分）（30分）（10分）（20分）（10分）（5分）（5分）（10分。上机十二运算符重载一、目的理解函数多态性的概念；掌握运算符重载的方法；体会运算符重载为成员函数与非成员函数的异同，会利用他们对运算符进行重载。二、要求：在上课之前，每一个同学必须将题目、程序编写完毕，做好充分的准备。所有环节均由每位同学独立完成，严禁抄袭他人结果。三、步骤和内容1、输入书上P309，例8-1。体会函数重载为成员函数的做法。2、在1的基础上添加复数类乘法，将其分别重载为成员函数和非成员函数。复数乘法：（a,b）*(c,d)=(ac-bd,bc+ad)3、在1的基础上，分别实现复数与实数和实数与复数的加法，他们有何不同？应该如何改动？四、思考题1、体会函数重载的两种方法。五、结果分析1.#include<iostream>usingnamespacestd;classComplex{public:Complex(doubler=0.0,doublei=0.0):real(r),imag(i){}Complexoperator+(constComplex&c2)const;Complexoperator-(constComplex&c2)const;voiddisplay()const;private:doublereal;doubleimag;};ComplexComplex::operator+(constComplex&c2)const{returnComplex(real+c2.real,imag+c2.imag);}ComplexComplex::operator-(constComplex&c2)const{returnComplex(real-c2.real,imag-c2.imag);}voidComplex::display()const{cout<<"("<<real<<","<<imag<<")"<<endl;}intmain(){Complexc1(5,4),c2(2,10),c3;cout<<"c1=";c1.display();cout<<"c2=";c2.display();c3=c1-c2;cout<<"c3=c1-c2=";c3.display();c3=c1+c2;cout<<"c3=c1+c2=";c3.display();return0;}2.//（a,b）*(c,d)=(ac-bd,bc+ad)#include<iostream>usingnamespacestd;classComplex{private:doublereal;doubleimag;public:voidoutput();//打印输出voidinitSet(doublere,doubleim);//初始化ComplexmatrixMul(ComplexZ1,Complex数类型为matrixmal};ComplexComplex::matrixMul(ComplexZ1,Complexdoubletemp1,temp2,temp3;Complexresult;temp1=Z1.real*Z2.imag;temp2=Z1.imag*Z2.real;temp3=(Z1.imag+Z1.real)*(Z2.real-Z2.imag);result.real=temp1+temp3-temp2;result.imag=temp1+temp2;returnresult;}voidComplex::initSet(doublere,doubleim){real=re;imag=im;}voidComplex::output(){if(imag>0){cout<<real<<"+"<<imag<<"i"<<endl;}elseif(imag==0){cout<<real<<endl;}elseif(imag<0){cout<<real<<imag<<"i"<<endl;}}intmain(){ComplexZ1,Z2,Z3,result;Z1.initSet(1,-2);Z2.initSet(3,-4);cout<<"第一个复数Z1为："<<endl;Z1.output();cout<<"第二个复数Z2为："<<endl;Z2.output();result=Z3.matrixMul(Z1,Z2);cout<<"两复数相乘结果的复数为："<<endl;result.output();return0;}3.#include<iostream>usingnamespacestd;classComplex{ //复数类定义public: //外部接口Complex(doubler=0.0,doublei=0.0):real(r),imag(i){}//构造函数Complexoperator+(constComplex&c2)const;//运算符+重载成员函数复数+复数Complexoperator-(constComplex&c2)const;//运算符-重载成员函数复数-复数Complexoperator+(double&b);//复数+实数Complexoperator-(double&b); //复数实数friendComplexoperator-(double&b,Complex&c2);friendComplexoperator+(double&b,Complex&c2)voiddisplay()const; //输出复数//voidget_Comp():private: //私有数据成员doublereal; //复数实doubleimag; //复数虚};Complexoperator+(double&b,Complex&c2){ //returnComplex(b+c2.real,c2.imag);}Complexoperator-(double&b,Complex&c2){ //实数returnComplex(b-c2.real,c2.imag);}ComplexComplex::operator+(constComplex&c2)const{ //重载运算符函数实现returnComplex(real+c2.real,imag+c2.imag);}ComplexComplex::operator-(constComplex&c2)const{ //重载运算符函数实现returnComplex(real-c2.real,imag-c2.imag);}ComplexComplex::operator+(double&b){returnComplex(real+b,imag);}ComplexComplex::operator-(double&b){returnComplex(b-real,imag);}voidComplex::display()const{cout<<"("<<real<<","<<imag<<")"<<endl;}intmain(){ //主函数Complexc1(5,4),c2(2,10),c3,c4,c5;//cout<<"c1=";c1.display();cout<<"c2=";c2.display();c3=c1-c2; //cout<<"c3=c1-c2=";c3.display();c3=c1+c2; //cout<<"c3=c1+c2=";c3.display();doublei=3;cout<<"i=3"<<endl;c3=c1+i;cout<<"c3=c1+i=";c3