7-1 复数类的运算 (20分)
根据以下代码段完善 ?? 处内容及程序内容,以实现规定的输出。
class Complex { public: Complex(double r=0, double i=0):real(r), imag(i){ } Complex operator+( ?? ) const;//重载双目运算符'+' Complex operator-=( ?? ); //重载双目运算符'-=' friend Complex operator-( ?? ) const;//重载双目运算符'-' void Display() const; private: double real; double imag; }; void Complex::Display() const { cout << "(" << real << ", " << imag << ")" << endl; } int main() { double r, m; cin >> r >> m; Complex c1(r, m); cin >> r >> m; Complex c2(r, m); Complex c3 = c1+c2; c3.Display(); c3 = c1-c2; c3.Display(); c3 -= c1; c3.Display(); return 0; }输入有两行,分别为两个复数的实部与虚部。
按样例格式输出结果。
在这里给出一组输入。例如:
4 2 3 -5在这里给出相应的输出。例如:
(7, -3) (1, 7) (-3, 5)代码实现:
#include <iostream> using namespace std; class Complex { public: Complex(double r=0, double i=0):real(r), imag(i){ } Complex operator+(Complex c) const;//重载双目运算符'+' Complex operator-=(Complex c); //重载双目运算符'-=' friend const Complex operator-(Complex c1,Complex c2) ;//重载双目运算符'-',const放在后面比较好 void Display() const; private: double real; double imag; }; Complex Complex::operator+ (Complex c)const{ //可以这样写,也可以像下面那样写,同时在这里的this和c的理解要透彻,比如c1+c2其本质上就是因为其为 //成员函数,不是全局函数,所以函数参数数目少一,而这里的this 指向的是c1而c是等价于c2的可以这么理解,重载运算符是重载运算 //符和后面的数 // c.imag=c.imag+this->imag; // c.real=c.real+this->real; return Complex(real+c.real,imag+c.imag);//这样更加简便,下面的减运算也是 } Complex Complex::operator-=(Complex c){//而这里的-=一定只能这样写,要不然就是错误的 this->imag=this->imag-c.imag; this->real=this->real-c.real; return *this; } const Complex operator-(Complex c1,Complex c2){ c1.imag=c1.imag-c2.imag; c1.real=c1.real-c2.real; return c1; } void Complex::Display() const { cout << "(" << real << ", " << imag << ")" << endl; } int main() { double r, m; cin >> r >> m; Complex c1(r, m); cin >> r >> m; Complex c2(r, m); Complex c3 = c1+c2; c3.Display(); c3 = c1-c2; c3.Display(); c3 -= c1; c3.Display(); return 0; }以上均为个人的小观点和小看法,如有错误,欢迎来指正。