C++第四章

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#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(1,1),c2(2,2),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(1,2),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;

}

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