l6_3.cpp

《C++程序设计教程》电子教案及例题源码

#include "iostream.h"

class  CComplex 
{
private:
	double real;
	double imag;
public:
	CComplex();
	CComplex(double r, double i);
	void Set(double r, double i);
	CComplex(CComplex &c);
	void Print();
	CComplex Add(CComplex c);
	CComplex Sub(CComplex c);
};

CComplex::CComplex()
{
	real = 0.0;
	imag = 0.0;
}

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

CComplex::CComplex (CComplex &c)
{
	real = c.real;
	imag = c.imag;
}


// set thc value of a CComplex
void CComplex::Set(double r, double i)
{
	real = r;
	imag = i;
}

// display a comnlex
void CComplex::Print()
{
	cout << "(" << real << "," << imag << ")" << endl;
}

// return the result of adding two CComplexes
CComplex CComplex::Add(CComplex c)
{
	CComplex temp;
	temp.real = real + c.real;
	temp.imag = imag + c.imag;
	return temp;
}

// return the result of substracting two CComplexes
CComplex CComplex::Sub(CComplex c)
{
	CComplex temp;
	temp.real = real - c.real;
	temp.imag = imag - c.imag;
	return temp;
}

// main program
void main(void)
{
	CComplex  a, b(3.0, 4.0), c;
	CComplex  d(b);

	cout << "a = ";
	a.Print();
	cout << "b = ";
	b.Print();
	cout << "d = ";
	d.Print();
	
	c = b.Add(d);
	d = a.Sub(d);

	cout << "c = ";
	c.Print();
	cout << "d = ";
	d.Print();
}