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c++复习一：复数运算的简单实现。

2016-11-11 14:12 441 查看

复数运算的简单实现。

程序很简单了。基本忘光了复数，重新了解了基本概念。如何在平面表示一个复数，复数的长度|x|=开根 a^2+b^2.和四则运算。

程序基本点：

封装和抽象：

1）封装成员数据，私有。

2）分治思想，或树形数据结构，来解决运算。子结果和运算数抽象为同一个类型。

main.cpp

#include <iostream>
#include "complexNumber.h"

using namespace std;

int main()
{
compleNumber a(2,4);
compleNumber b(3,5);
compleNumber c=a/b+a;
cout<<c<<endl;

return 0;
}

complexNumber.h

#ifndef COMPLEXNUMBER_H_INCLUDED
#define COMPLEXNUMBER_H_INCLUDED

#include <iostream>

using namespace std;

class compleNumber
{
public:
compleNumber(float,float);
float getRealPart()const;
float getComplexPart()const;
private:
compleNumber();
float a;
float b;
};

compleNumber operator+(const compleNumber&,const compleNumber&);
compleNumber operator-(const compleNumber&,const compleNumber&);
compleNumber operator*(const compleNumber&,const compleNumber&);
compleNumber operator/(const compleNumber&,const compleNumber&);

ostream& operator<<(ostream& os,const compleNumber& complexNumb);

#endif // COMPLEXNUMBER_H_INCLUDED


complexNumber.cpp

//class compleNumber
//{
//public:
//    compleNumber(float,float);
//private:
//    compleNumber();
//    float a;
//    float b;
//};
//
//compleNumber operator+(const compleNumber&,const compleNumber&);
//compleNumber operator-(const compleNumber&,const compleNumber&);
//compleNumber operator*(const compleNumber&,const compleNumber&);
//compleNumber operator/(const compleNumber&,const compleNumber&);

#include "complexNumber.h"

compleNumber::compleNumber(float _a,float _b):a(_a),b(_b){}

ostream& operator<<(ostream& os,const compleNumber& complexNumb)
{
return os<<complexNumb.getRealPart()<<"+"<<complexNumb.getComplexPart()<<"i";
}

float compleNumber::getRealPart()const
{
return a;
}
float compleNumber::getComplexPart()const
{
return b;
}

compleNumber operator+(const compleNumber& left,const compleNumber& right)
{
compleNumber ret(left.getRealPart()+right.getRealPart(),left.getComplexPart()+right.getComplexPart());
return ret;
}

compleNumber operator-(const compleNumber& left,const compleNumber& right)
{
compleNumber ret(left.getRealPart()-right.getRealPart(),left.getComplexPart()-right.getComplexPart());
return ret;
}

compleNumber operator*(const compleNumber& left,const compleNumber& right)
{
compleNumber ret(left.getRealPart()*right.getRealPart()-left.getComplexPart()*right.getComplexPart(),left.getRealPart()*right.getComplexPart()+left.getComplexPart()*right.getRealPart());
return ret;
}

compleNumber operator/(const compleNumber& left,const compleNumber& right)
{
double PYfenmu=right.getComplexPart()*right.getComplexPart()+right.getRealPart()*right.getRealPart();
double realpart=(left.getRealPart()*right.getRealPart()+left.getComplexPart()*right.getComplexPart())/PYfenmu;
double complexPart=(left.getComplexPart()*right.getRealPart()-left.getRealPart()*right.getComplexPart())/PYfenmu;
compleNumber ret(realpart,complexPart);
return ret;
}

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