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;
}
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