operater int()

class Number
{
??? int number;
public:
??? explicit Number(int n){number = n;}
??? operator int() //注意一定不能聲明返回值
??? {
??????? return number;
??? }
};
int main () {

??? Number n1 = Number(100);
??? int n2= n1;
??? cout << n2 << endl;
??? return 0;
}