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昨天关门了。
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我对C中的类还是个新手。我用C写了一段代码，用Xcode输入/输出复数之和，不知怎么的，输出不是它应该的样子。
这是我的代码：

#include <iostream>
using namespace std;

class Complex {
private:
double re,im;
public:
Complex (double Re=0, double Im=0): re(Re), im(Im) { }

friend Complex operator+(Complex z1, Complex z2){
    return Complex(z1.re+z2.re, z1.im+z2.im); }

friend ostream& operator<<(ostream& stream, Complex z){
    stream << "(" << z.re << "," << z.im << ")" ;
    return stream; }

friend istream& operator>>(istream& stream, Complex& z){
    char c1,c2,c3;
    double x,y;
    stream >> c1 >> x >> c2 >> y >> c3;
    if (c1!='(' || c2!=',' || c3!=')')
        stream.setstate(ios::failbit);
    z = Complex(x,y);
    return stream; }
};

int main() {
    Complex z1,z2;
    cout << "z1 z2: "; cin >> z1 >> z2;
    cout << "z1+z2 = " << z1+z2 << endl;
return 0; }

有人能告诉我我的错误在哪里，以及如何解决/改进它吗？
Xcode首先说"Build successed"，我用不同的输入测试过很多次，但输出从来都不正确。
例如

z1 = (1,2) z2 = (3,4)  output is (2,4)
z1 = (5,6) z2 = (7,8)  output is (10,12)

我的意见：

z1 z2:(1,2) (3,4)
z1+z2 = (2,4)
Program ended with exit code: 0

对于这个输入，我有：

z1 z2:(12,3)

z1+z2 = (24,6)
Program ended with exit code: 0

先谢了!