c++面向对象程序设计 课后题 答案 谭浩强 第四章

c++面向对象程序设计课后题答案 谭浩强 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 get_real();

double get_imag();

void display();

private:

double real;

double imag;

};

double Complex::get_real()

{return real;}

double Complex::get_imag()

{return imag;}

void Complex::display()

{cout<<"("<<real<<","<<imag<<"i)"<<endl;}

Complex operator + (Complex &c1,Complex &c2)

{

return Complex(c1.get_real()+c2.get_real(),c1.get_imag()+c2.get_imag());

}

int main()

{Complex c1(3,4),c2(5,-10),c3;

c3=c1+c2;

cout<<"c3=";

c3.display();

return 0;

}

c++面向对象程序设计课后题答案 谭浩强

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 &c2);

Complex operator-(Complex &c2);

Complex operator*(Complex &c2);

Complex operator/(Complex &c2);

void display();

private:

double real;

double imag;

};

Complex Complex::operator+(Complex &c2)

{Complex c;

c.real=real+c2.real;

c.imag=imag+c2.imag;

return c;}

Complex Complex::operator-(Complex &c2)

{Complex c;

c.real=real-c2.real;

c.imag=imag-c2.imag;

return c;}

Complex Complex::operator*(Complex &c2)

{Complex c;

c.real=real*c2.real-imag*c2.imag;

c.imag=imag*c2.real+real*c2.imag;

return c;}

Complex Complex::operator/(Complex &c2)

{Complex c;

c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);

c.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);

return c;}

void Complex::display()

{cout<<"("<<real<<","<<imag<<"i)"<<endl;}

int main()

{Complex c1(3,4),c2(5,-10),c3;

c3=c1+c2;

cout<<"c1+c2=";

c3.display();

c3=c1-c2;

cout<<"c1-c2=";

c3.display();

c3=c1*c2;

cout<<"c1*c2=";

c3.display();

c3=c1/c2;

cout<<"c1/c2=";

c3.display();

return 0;

}

c++面向对象程序设计课后题答案 谭浩强

3:

#include <iostream>        //用VC++时改为∶ #include <iostream.h>

using namespace std;      //用VC++时为取消此行

class Complex

{public:

Complex(){real=0;imag=0;}

Complex(double r,double i){real=r;imag=i;}

Complex operator+(Complex &c2);

Complex operator+(int &i);

friend Complex operator+(int&,Complex &);

void display();

private:

double real;

double imag;

};

Complex Complex::operator+(Complex &c)

{return Complex(real+c.real,imag+c.imag);}

Complex Complex::operator+(int &i)

{return Complex(real+i,imag);}

void Complex::display()

{cout<<"("<<real<<","<<imag<<"i)"<<endl;}

Complex operator+(int &i,Complex &c)

{return Complex(i+c.real,c.imag);}

int main()

{Complex c1(3,4),c2(5,-10),c3;

int i=5;

c3=c1+c2;

cout<<"c1+c2=";

c3.display();

c3=i+c1;

cout<<"i+c1=";

c3.display();

c3=c1+i;

cout<<"c1+i=";

c3.display();

return 0;

}

谭浩强

4:

#include <iostream>

using namespace std;

class Matrix                                          //定义Matrix类

{public:

Matrix();                                          //默认构造函数

friend Matrix operator+(Matrix &,Matrix &);        //重载运算符“+”

void input();                                      //输入数据函数

void display();                                    //输出数据函数

private:

int mat[2][3];

};

Matrix::Matrix()                                      //定义构造函数

{for(int i=0;i<2;i++)

for(int j=0;j<3;j++)

mat[i][j]=0;

}

Matrix operator+(Matrix &a,Matrix &b)                //定义重载运算符“+”函数

{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()                                   //定义输入数据函数

{cout<<"input value of matrix:"<<endl;

for(int i=0;i<2;i++)

for(int j=0;j<3;j++)

cin>>mat[i][j];

}

void Matrix::display()                                //定义输出数据函数

{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();

cout<<endl<<"Matrix a:"<<endl;

a.display();

cout<<endl<<"Matrix b:"<<endl;

b.display();

c=a+b;                                         //用重载运算符“+”实现两个矩阵相加

cout<<endl<<"Matrix c = Matrix a + Matrix b :"<<endl;

c.display();

return 0;

}

c++面向对象程序设计课后题答案

5:

#include <iostream.h>

//using namespace std;

class Matrix

{public:

Matrix();

friend Matrix operator+(Matrix &,Matrix &);

friend ostream& operator<<(ostream&,Matrix&);

friend istream& operator>>(istream&,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 &m)

{cout<<"input value of matrix:"<<endl;

for(int i=0;i<2;i++)

for(int j=0;j<3;j++)

in>>m.mat[i][j];

return in;

}

ostream& operator<<(ostream &out,Matrix &m)

{for (int i=0;i<2;i++)

{for(int j=0;j<3;j++)

{out<<m.mat[i][j]<<" ";}

out<<endl;}

return out;

}

int main()

{ Matrix a,b,c;

cin>>a;

cin>>b;

cout<<endl<<"Matrix a:"<<endl<<a<<endl;

cout<<endl<<"Matrix b:"<<endl<<b<<endl;

c=a+b;

cout<<endl<<"Matrix c = Matrix a + Matrix b :"<<endl<<c<<endl;

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();

private:

double real;

double imag;

};

void Complex::display()

{cout<<"("<<real<<", "<<imag<<")"<<endl;}

int main()

{Complex c1(3,4),c2;

double d1;

d1=2.5+c1;

cout<<"d1="<<d1<<endl;

c2=Complex(d1);

cout<<"c2=";

c2.display();

return 0;

}

7:

#include <iostream>

using namespace std;

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<<"\nname:"<<name<<"\nsex:"<<sex<<"\nscore:"<<score<<"\n\n";}

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&);

Teacher(int n,char nam[],char sex,float pay);

void display();

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=1500;}

void Teacher::display()

{cout<<"num:"<<num<<"\nname:"<<name<<"\nsex:"<<sex<<"\npay:"<<pay<<"\n\n";}

int main()

{Teacher teacher1(10001,"Li",'f',1234.5),teacher2;

Student student1(20010,"Wang",'m',89.5);

cout<<"student1:"<<endl;

student1.display();

teacher2=Teacher(student1);

cout<<"teacher2:"<<endl;

teacher2.display();

return 0;

}