#include<iostream>
using namespace std;
class xs
{
private:
    double re,im;
public:
     xs(double r,double i);
    void print()const;
    xs operator*(const xs& b);
    xs& operator++();
    xs operator++(int);
};
xs:: xs(double r,double i)
    {
        re=r;
        im=i;
    }
void xs::print()const
    {
        cout<<re<<"+"<<im<<"i"<<endl;
    }
xs xs::operator*(const xs& b)
    {
        xs t(re*b.re-im*b.im,re*b.im+im*b.re);
        return t;
    }
xs& xs::operator++()
    {
        ++re;
        ++im;
        xs a(re,im);
        return a;
    }//这个地方运行结果出问题了
xs xs::operator++(int)
    {
        xs ori(re,im);
        ++re;
        ++im;
        return ori;

    }
int main()
{   xs z1(1,2),z2(3,4);
    (z1*z2).print();
    (z1++).print();
    z1.print();
    (++z1).print();
    system("pause");
    return 0;
}
运行结果：
-5+10i
1+2i
2+3i
-9.25596e+061+-9.25596e+061i//这个结果。。。

啊哦，用对象指针可以了。

xs& xs::operator++()
    {
        ++re;
        ++im;
        return *this;
    }
xs xs::operator++(int)
    {
        xs ori(*this);
        ++(*this);
        return ori;

    }

一不小心自问自答了。。。那个奇怪的运行结果是为什么呢？