#include<iostream>
using namespace std;
class M23
{
public:
    //M23 operator +(M23 &c2);
    friend M23 operator+(M23&,M23&);
    friend ostream& operator<<(ostream&,const M23&);
    friend istream& operator>>(istream&,const M23&);
private:
    int a[2][3];
};
ostream& operator<<(ostream& out,const M23& m)
{
     for(int i=0;i<2;i++)
     {
         for(int j=0;j<3;j++)
         {
             out<<m.a[i][j];
         }
         return out;

     }
}
istream& operator>>(istream& in,const M23& m)
{
   
    for(int i=0;i<2;i++)
    {
        for(int j=0;j<3;j++)
            in>>m.a[i][j];
    }
    return in;
}
M23 operator+(M23& m1,M23& m2)
{
    M23 m;
    for(int i=0;i<2;++i)
        for(int j=0;j<3;++j)
            m.a[i][j] = m1.a[i][j] + m2.a[i][j];

    return m;
}
/*M23 M23::operator +(M23 &c2)
{
      
}*/
int main()
{
    M23 m1,m2,m3;
    cin>>m1>>m2;
    m3 = m1 + m2;
    cout<<m1<<endl<<m2<<endl<<m3<<endl;
    return 0;
}

--------------------Configuration: 10_4 - Win32 Debug--------------------
Compiling...
10_4.cpp
F:\Study Garden\上机内容\c++\10_4\10_4.cpp(7) : fatal error C1001: INTERNAL COMPILER ERROR
        (compiler file 'msc1.cpp', line 1786)
         Please choose the Technical Support command on the Visual C++
         Help menu, or open the Technical Support help file for more information
执行 cl.exe 时出错.

10_4.obj - 1 error(s), 0 warning(s)