C++第四章

1.#include <iostream>using namespace std;class Complex{public:Complex(){ real=0; imag=0;}Complex(double r,double i){ real=r; imag=i;}double getreal(){ return real;}double getimag(){ return imag;}void display(){ cout<<"("<<real<<"+"<<imag<<"i)"<<endl;}private:double real;double imag;};Complex operator +(Complex &c1,Complex &c2){ return Complex(c1.getreal()+c2.getreal(),c1.getimag()+c2.getimag());}int main(){ Complex c1(1,2),c2(3,4),c3; c3=c1+c2; cout<<"c3="; c3.display(); return 0;}

2. #include <iostream>using namespace std;class Complex{public:Complex(){ real=0; imag=0;}Complex(double r,double i){ real=r; imag=i;}    Complex operator +(Complex &);Complex operator -(Complex &);Complex operator *(Complex &);Complex operator /(Complex &);void display(){ cout<<"("<<real<<"+"<<imag<<"i)"<<endl;}private:double real;double imag;};Complex Complex::operator +(Complex &c2){ return Complex(real+c2.real,imag+c2.imag);}Complex Complex::operator -(Complex &c2){ return Complex(real-c2.real,imag-c2.imag);}Complex Complex::operator *(Complex &c2){ return Complex(real*c2.real,imag*c2.imag);}Complex Complex::operator /(Complex &c2){ return Complex(real/c2.real,imag/c2.imag);}int main(){ Complex c1(2,4),c2(1,2),c3,c4,c5,c6; c3=c1+c2; cout<<"c3=c1+c2="; c3.display(); c4=c1-c2; cout<<"c4=c1-c2="; c4.display(); c5=c1*c2; cout<<"c5=c1*c2="; c5.display(); c6=c1/c2; cout<<"c6=c1/c2="; c6.display(); return 0;}

3.#include <iostream.h>class Complex{public:Complex(){ real=0; imag=0;}Complex(double r,double i){ real=r; imag=i;}    Complex operator +(Complex &);Complex operator +(int &);friend Complex operator +(int &,Complex &);void display(){ cout<<"("<<real<<"+"<<imag<<"i)"<<endl;}private:double real;double imag;};Complex Complex::operator +(Complex &c2){ return Complex(real+c2.real,imag+c2.imag);}Complex Complex::operator +(int &i){ return Complex(real+i,imag);}Complex operator +(int &i,Complex &c3){ return Complex(i+c3.real,c3.imag);}int main(){ int i=2; Complex c1(2,4),c2(1,2),c3,c4,c5; c3=c1+c2; cout<<"c3=c1+c2="; c3.display(); c4=c1+i; cout<<"c4=c1+i="; c4.display(); c5=i+c2; cout<<"c5=i+c2="; c5.display(); return 0;}

4. #include <iostream.h>class Matrix{public:Matrix();friend Matrix operator +(Matrix &,Matrix &);void input();void display();private:int mat[2][3];};Matrix::Matrix(){ for(int i=0;i<2;i++) for(int j=0;j<3;j++) mat[i][j]=0;}Matrix operator +(Matrix &a,Matrix &b){ Matrix c; for(int i=0;i<2;i++) for(int j=0;j<3;j++) c.mat[i][j]=a.mat[i][j]+b.mat[i][j]; return c;}void Matrix::input(){ for(int i=0;i<2;i++) for(int j=0;j<3;j++) cin>>mat[i][j];}void Matrix::display(){ for(int i=0;i<2;i++) for(int j=0;j<3;j++) {cout<<mat[i][j]<<" "; cout<<endl;}}int main(){ Matrix a,b,c; a.input(); b.input(); c=a+b; c.display(); return 0;}

5. #include <iostream.h>class Matrix{public:Matrix();friend Matrix operator +(Matrix &,Matrix &);friend istream& operator >>(istream &,Matrix &);friend ostream& operator <<(ostream &,Matrix &);private:int mat[2][3];};Matrix::Matrix(){ for(int i=0;i<2;i++) for(int j=0;j<3;j++) mat[i][j]=0;}Matrix operator +(Matrix &a,Matrix &b){ Matrix c; for(int i=0;i<2;i++) for(int j=0;j<3;j++) c.mat[i][j]=a.mat[i][j]+b.mat[i][j]; return c;}istream & operator >>(istream & in,Matrix &c){ for(int i=0;i<2;i++) for(int j=0;j<3;j++) in>>c.mat[i][j]; return in;}ostream & operator <<(ostream & out,Matrix &c){ for(int i=0;i<2;i++) for(int j=0;j<3;j++) {     out<<c.mat[i][j]<<" "; cout<<endl; } return out;}int main(){ Matrix a,b,c; cin>>a; cout<<a; cin>>b; cout<<b; c=a+b; cout<<c; return 0;}

6. #include <iostream>using namespace std;class Complex{public:Complex(){ real=0; imag=0;}Complex(double r){ real=r; imag=0;}Complex(double r,double i){ real=r; imag=i;}operator double(){ return real;}void display(){ cout<<"("<<real<<"+"<<imag<<"i)"<<endl;}private:double real;double imag;};int main(){ int i=2; Complex c1(2,4),c2; double d1; d1=2.5+c1; cout<<"d1="<<d1<<endl; c2=Complex(d1); cout<<"c2="<<c2.display<<endl; return 0;}

7. #include <iostream>using namespace std;#include <cstring>class Student{public:Student(int,char[],char,float);int get_num(){ return num;}char * get_name(){ return name;}char get_sex(){ return sex;}void display(){ cout<<"num="<<num<<endl; cout<<"name="<<name<<endl; cout<<"sex="<<sex<<endl; cout<<"score="<<score<<endl;}private:int num;char name[20];char sex;float score;};Student::Student(int n,char nam[],char s,float so){ num=n; strcpy(name,nam); sex=s; score=so;}class Teacher{public:Teacher(){}Teacher(Student &stud){  num=stud.get_num();      strcpy(name,stud.get_name());      sex=stud.get_sex();      pay=3000;}    Teacher(int n,char nam[],char s,float p){       num=n;       strcpy(name,nam);       sex=s;       pay=p;}void display(){ cout<<"num="<<num<<endl; cout<<"name="<<name<<endl; cout<<"sex="<<sex<<endl; cout<<"pay="<<pay<<endl;}private:int num;char name[20];char sex;float pay;};//Teacher::Teacher(int n,char nam[],char s,float p){ num=n; strcpy(name,nam); sex=s; pay=p;}//Teacher::Teacher(Student &stud){num=stud.get_num();strcpy(name,stud.get_name());sex=stud.get_sex();pay=3000;}int main(){Teacher t1;Student s1(1,"xian",'F',100);cout<<"s1:"<<endl;s1.display();t1=Teacher(s1);cout<<"t1:"<<endl;t1.display();return 0;}