#include <iostream>
#include <string>
#include <cstdlib>
 
using namespace std;
 
class NumExpr {
    public:
        NumExpr( string v );
        string name();
    private:
        int number;
        friend ostream& operator<<(ostream &s, const NumExpr &num);
};
 
NumExpr::NumExpr( string n ) {
    number = atoi( n.c_str() );
}
string NumExpr::name() {
    return "num";
}
ostream & operator<<(ostream &s, const NumExpr &num) {
    s << num.number;
    return s;
}
 
int main(){
 
	NumExpr e("10");
	std::cout<<e;
}
 

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