复数的四则运算—

复数的四则运算法则：

加法：(a+bi)+(c+di)=(a+c)+(b+d)i
减法：(a+b)-(c+di)=(a-c)+(b-d)i
乘法：(a+bi)*(c+di)=(ac-bd)+(bc+ad)i
除法：(a+bi)/(c+di)=((ac+bd)+(bc-ad)i)/(c2+d2)
注意：在复数除法运算中，若c、d均为0，则不可计算（除数不能为0）。

1、代码中直接输入参数：
C++代码：

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;class Complex {public:Complex(double real, double imag) {this->real = real;this->imag = imag;}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);void Print_Complex();
private:double real;double imag;
};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) {return Complex(c1.real*c2.real - c1.imag*c2.imag, c1.real*c2.imag + c1.imag*c2.real);
}Complex operator/(Complex c1, Complex c2) {if (c2.real == 0 && c2.imag == 0) {cout << "Error  ";return c2;}else {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::Print_Complex() {if (real == 0) {cout << imag << "i" << endl;}else {if (imag > 0) {cout << real << "+" << imag << "i" << endl;}else {cout << real << imag << "i" << endl;}}
}int main() {Complex c1(1, 3);Complex c2(1, 1);Complex c3 = c1 + c2;cout << "Add:";c3.Print_Complex();Complex c4 = c1 - c2;cout << "Minus:";c4.Print_Complex();Complex c5 = c1 * c2;cout << "Mul:";c5.Print_Complex();Complex c6 = c1 / c2;cout << "Div:";c6.Print_Complex();return 0;
}

C++运行结果：
说明：若c2的实部和虚部均为0，输出结果为：
2 、如果想自己输入参数，代码如下：
C++代码：

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;class Complex {public:Complex() {this->real = 0;this->imag = 0;}Complex(double real, double imag) {this->real = real;this->imag = imag;}void setRI(double real, double imag) {this->real = real;this->imag = imag;}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);void Print_Complex();
private:double real;double imag;
};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) {return Complex(c1.real*c2.real - c1.imag*c2.imag, c1.real*c2.imag + c1.imag*c2.real);
}Complex operator/(Complex c1, Complex c2) {if (c2.real == 0 && c2.imag == 0) {cout << "c2 Error  ";return c2;}else {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::Print_Complex() {if (real == 0) {cout << imag << "i" << endl;}else {if (imag > 0) {cout << real << "+" << imag << "i" << endl;}else {cout << real << imag << "i" << endl;}}
}int main() {Complex c1, c2;double real, imag;cout << "Please input c1 real:";cin >> real;cout << "Please input c1 imag:";cin >> imag;c1.setRI(real, imag);cout << "Please input c2 real:";cin >> real;cout << "Please input c2 imag:";cin >> imag;c2.setRI(real, imag);Complex c3 = c1 + c2;cout << "Add:";c3.Print_Complex();Complex c4 = c1 - c2;cout << "Minus:";c4.Print_Complex();Complex c5 = c1 * c2;cout << "Mul:";c5.Print_Complex();Complex c6 = c1 / c2;cout << "Div:";c6.Print_Complex();return 0;
}

C++运行结果：

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