C++ 第四章课后习题作业

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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;}<img src="http://img.blog.csdn.net/20150520110939972?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />2. #include<iostream>using namespacestd;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;};ComplexComplex::operator +(Complex &c2){ return Complex(real+c2.real,imag+c2.imag);}ComplexComplex::operator -(Complex &c2){ return Complex(real-c2.real,imag-c2.imag);}ComplexComplex::operator *(Complex &c2){ return Complex(real*c2.real,imag*c2.imag);}ComplexComplex::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;}<img src="http://img.blog.csdn.net/20150520110945947?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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;};ComplexComplex::operator +(Complex &c2){ return Complex(real+c2.real,imag+c2.imag);}ComplexComplex::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;}<img src="http://img.blog.csdn.net/20150520110909923?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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];}voidMatrix::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;}<img src="http://img.blog.csdn.net/20150520110915320?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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 namespacestd;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. <img src="http://img.blog.csdn.net/20150520110920999?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />#include<iostream>using namespacestd;#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(intn,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(intn,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;}<img src="http://img.blog.csdn.net/20150520111007896?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGlwaTA5MDgwN2xpbGk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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