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#include<iostream>
#include<string>
using namespace std;
class product{
    public:
        product();
        void mark(string i,float p);
        bool if_same(product a);
        void setvalid(bool);
        bool ifvalid(); 
        void output();
        string getID();
        float getPrice();
                 
    private:
        string id;
        float price;
        bool valid; 
};
product::product(){
    id = "";
    price = 0;
    valid = true;
}
void product::mark(string i,float p){
    id = i;
    price = p;
}
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