第九周 C++任务一。定义Complex类中的>运算符的重载，实现输入和输出

【任务1】接第8周任务2，定义Complex类中的<<和>>运算符的重载，实现输入和输出，改造原程序中对运算结果显示方式，使程序读起来更自然。

 

#include <iostream>   

using namespace std;  

class Complex  
{  
public:  
    Complex(){real = 0; imag = 0;}  
    Complex(double r, double i){real = r; imag = i;}  

    friend istream& operator >> (istream&input,  Complex&c1);
	friend ostream& operator << (ostream&output, Complex&c1);
    friend Complex operator+ (Complex &c1, Complex &c2);  
    friend Complex operator- (Complex &c1, Complex &c2);  
    friend Complex operator* (Complex &c1, Complex &c2);  
    friend Complex operator/ (Complex &c1, Complex &c2);  
    friend Complex operator+ (Complex &c1, const double &d); 
    friend Complex operator- (Complex &c1, const double &d);  
    friend Complex operator* (Complex &c1, const double &d);  
    friend Complex operator/ (Complex &c1, const double &d);  
    friend Complex operator+ (const double &d,Complex &c1);  
    friend Complex operator- (const double &d,Complex &c1);  
    friend Complex operator* (const double &d,Complex &c1);  
    friend Complex operator/ (const double &d,Complex &c1);  
    friend Complex operator- (Complex &c1);  

private:  
    double real;  
    double imag;  
};    
//下面定义友元函数   

istream& operator >> (istream& input, Complex& c)
{
	char c1;  
    cout << "input real part and imaginary part of complex number:";  
    input >> c.real >> c.imag >> c1;  
    return input;  
}
ostream& operator << (ostream& output,Complex& c)
{
	output<<"("<<c.real;
	if(c.imag>=0) output<<"+";
	output << c.imag << "i)" <<endl;
	return output;
}
Complex operator+ (Complex &c1, Complex &c2)  
{  
    return Complex(c1.real + c2.real, c1.imag + c2.imag);  
} 
Complex operator- (Complex &c1, Complex &c2)  
{  
    return Complex(c1.real - c2.real, c1.imag - c2.imag);  
}  
Complex operator* (Complex &c1, Complex &c2)  
{  
    Complex c;  

    c.real = c1.real*c2.real - c1.imag*c2.imag;  
    c.imag = c1.real*c2.imag + c1.imag*c2.real;  

    return c;  
}  
Complex operator/ (Complex &c1, Complex &c2)  
{  
    Complex c;  

    c.real = (c1.real*c2.real + c1.imag*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);  
    c.imag = (-c1.real*c2.imag + c1.imag*c2.real)/(c2.real*c2.real + c2.imag*c2.imag);  

    return c;  
}  

Complex operator+ (Complex &c1, const double &d)  
{  
    Complex c;  
    c.real = c1.real+d;  
    c.imag = c1.imag;  
    return c;  

}  

Complex operator+ (const double &d, Complex &c1)  
{  
    Complex c;  
    c.real = d+c1.real;  
    c.imag = c1.imag;  
    return c;  
}  
Complex operator- (Complex &c1, const double &d)  
{  
    Complex c;  
    c.real = c1.real-d;  
    c.imag = c1.imag;  
    return c;  

}  
Complex operator- ( const double &d, Complex &c1)  
{  
    Complex c;  
    c.real = d - c1.real;  
    c.imag = - c1.imag;  
    return c;  

}  
Complex operator* (Complex &c1, const double &d)  
{  
    Complex c;  

    c.real = c1.real*d;  
    c.imag = c1.imag*d;  

    return c;  
}  
Complex operator* ( const double &d, Complex &c1)  
{  
    Complex c;  

    c.real = d*c1.real;  
    c.imag = d*c1.imag;  

    return c;  
}  
Complex operator/ (Complex &c1, const double &d)  
{  
    Complex c;  

    c.real = c1.real/d;  
    c.imag = c1.imag/d;  

    return c;  
}  
Complex operator/ ( const double &d, Complex &c1)  
{  
    Complex c;  

    c.real = d/c1.real;  
    c.imag = d/c1.imag;  

    return c;  
}  
Complex operator- (Complex &c1)  
{  
    Complex c;  
    c.real = -c1.real;  
    c.imag = -c1.imag;  

    return c;  
}  



int main()  
{   
	double s = 2.5;
    Complex c1, c2, c3;  
	cin>>c1;
    cout << "请再输入一个复数：" << endl; 
	cin>>c2;
    cout<<"c1="<<c1;   
    cout<<"c2="<<c2;  

    c3 = c1 + c2;  
    cout<<"c1+c2="; 
	cout << c3;

    c3 = c1 - c2;  
    cout<<"c1-c2=";  
    cout << c3;

    c3 = c1 * c2;  
    cout<<"c1*c2=";  
    cout << c3; 

    c3 = c1 / c2;  
    cout<<"c1/c2=";  
    cout << c3;  

    c3= c1 + s;  
    cout<<"c1 + s=";  
    cout << c3; 

    c3= c1 - s;  
    cout<<"c1 - s=";  
    cout << c3;  

    c3= c1 * s;  

    cout<<"c1 * s=";  
    cout << c3;  

    c3= c1 / s;  
    cout<<"c1 / s=";  
    cout << c3;   

    c3= s + c1;  
    cout<<" s+c1 =";  
    cout << c3; 

    c3= s - c1 ;  
    cout<<" s-c1 =";  
    cout << c3; 

    c3 = s * c1 ;  
    cout<<" s*c1 =";  
    cout << c3;  

    c3 = s /c1  ;  
    cout<<" s/c1 =";  
    cout << c3; 

    c3= -c1;  
    cout<<"-c1=";  
    cout << c3;  

    system("pause");  
    return 0;  
}  

 

积累经验 ：  在输入符号的时候，注意定义一个CHAR.