002: 看上去好坑的运算符重载

#include <iostream> 
using namespace std;
class MyInt 
{
    
     
 int nVal; 
 public: 
 MyInt( int n) {
    
     nVal = n ;}
MyInt& operator-(int n)
 {
    
    
  nVal-=n;
  return *this;
 }
 int getnVal() const
 {
    
    
  return nVal;
 }
 friend int Inc(const MyInt& my)
 {
    
    
  return  my.getnVal()+1;
 }
}; 
int Inc(int n) {
    
    
 return n + 1;
}
int main () {
    
     
 int n;
 while(cin >>n) {
    
    
  MyInt objInt(n); 
  objInt-2-1-3; 
  cout << Inc(objInt);
  cout <<","; 
  objInt-2-1; 
  cout << Inc(objInt) << endl;
 }
 return 0;
}