第八周項目-1.2

#include<iostream>
using namespace std;
class Complex
{
public:
Complex(){ real = 0; imag = 0; }
Complex(double r, double i){ real = r; imag = i; }
friend Complex operator + (const Complex &c1,const Complex &c2);
friend Complex operator - (const Complex &c1, const Complex &c2);
friend Complex operator*(const Complex &c1, const Complex &c2);
friend Complex operator/(const Complex &c1, const Complex &c2);
void display();
private:
double real;
double imag;
};
//下面定義成員函數
Complex operator+(const Complex &c1, const Complex &c2)
{
return Complex(c1.real + c2.real, c1.imag + c2.imag);
}
Complex operator-(const Complex &c1, const Complex &c2)
{
return Complex(c1.real - c2.real, c1.imag - c2.imag);
}
Complex operator*(const Complex &c1, const Complex &c2)
{
return Complex(c1.real*c2.real - c1.imag*c2.imag, c1.real*c2.imag + c1.imag*c2.real);
}
Complex operator/(const Complex &c1, const Complex &c2)//(ac+bd)/(c^2+d^2)+〔(bc-ad)/(c^2+d^2)〕i
{
return Complex((c1.real*c2.real + c1.imag*c2.imag) / (c2.real*c2.real + c2.imag*c2.imag), (c1.imag*c2.real - c1.real*c2.imag) / (c2.real*c2.real + c2.imag*c2.imag));
}
void Complex::display()
{
if (imag == 0)
cout << real << endl;
else if (imag < 0)
cout << real << " - " << -imag << "i" << endl;
else
cout << real << " + " << imag << "i" << endl;
}
//下面定義用于測試的main()函數
int main()
{
Complex c1(3, 4), c2(5, ⑴0), c3;
cout << "c1=";
c1.display();
cout << "c2=";
c2.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();
c3 = c1 / c2;
cout << "c1/c2=";
c3.display();
while (1){}
return 0;
}