C++ looks like a pit operator overloading

Total time limit: 

1000ms

Memory limit: 

65536kB

describe

program fill in the blanks

#include <iostream>
using namespace std;
class MyInt
{
	int nVal;
	public:
	MyInt( int n) { nVal = n ;}

// add your code here

};
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;
}

Input multiple sets of data, one line per set, integer n output For each set of data, output one line, including two integers, n-5 and n-8 sample input

20
30

Sample output

15,12

25,22

#include <iostream>
using namespace std;
class MyInt
{
	int nVal;
	public:
	MyInt( int n) { nVal = n ;}

MyInt& operator -(int a){
        nVal-=a;
        return *this;
    }
    operator int () {
    return nVal;
    }
};
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;
}