北大 C++ 4.5 流插入和流输出运算符重载

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//Code is tested based on Visual Studio 2015.#include <iostream>#include <string>#include <cstdlib>using namespace std;class Complex {private:double real, imag;public:Complex(double x, double y) {real = x;imag = y;}Complex() {}double gr() { return real; }double gi() { return imag; }};ostream & operator<<(ostream & o,Complex & c) {o << c.gr() << "+" << c.gi() << "i";return o;}int main() {Complex c(2,4);cout << c << endl << c << endl;system("pause");return 0;}