16 oj 复数类 重载运算符+

/*定义一个复数类Complex，重载运算符“+”，使之能用于复数的加法运算。
将运算符函数重载为非成员、非友元的普通函数。编写程序，求两个复数之和。
*/
#include <iostream>
#include <iomanip>
using namespace std;
class Complex
{
public:
    Complex();
    Complex(double r,double i);
    double get_real();
    double get_imag();
    void display();
private:
    double real;
    double imag;
};
//主函数已给定如下，提交时不需要包含，会自动添加到程序尾部
Complex operator+(Complex &,Complex &);
Complex operator+(Complex &c1,Complex &c2)
{
    double r,i;
    r=c1.get_real()+c2.get_real();
    i=c1.get_imag()+c2.get_imag();
    return Complex(r,i);
}
Complex::Complex()
{
    real=0;
    imag=0;
}
Complex::Complex(double r,double i):real(r),imag(i) {}
double Complex::get_real()
{
    return real;
}
double Complex::get_imag()
{
    return imag;
}
void Complex::display()
{
    cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
/* C++代码 */
int main()
{
    double real,imag;
    cin>>real>>imag;
    Complex c1(real,imag);
    cin>>real>>imag;
    Complex c2(real,imag);
    Complex c3=c1+c2;
    cout<<setiosflags(ios::fixed);
    cout<<setprecision(2);
    c3.display();
    return 0;
}