//************************************************
//this function permit use object in expression
//with different type
//************************************************

#include <iostream>
using namespace std;

//------------------------------------------------
class stack{
	int stk[10];
	int tos;
public:
	stack(){tos=0;}
	void push(int i){
		if(tos<10) {
			stk[tos]=i;
			tos++;
		}
		else cout<<"Stack full!\n";
	}
	int pop(){
		if(tos==0) {
			cout<<"Stack empty!\n";
			return 0;
			}
		else {
			tos--;		
			return stk[tos];
		}	
	}
	operator int(){return stk[tos-1];}
};

int menu(stack &ob){
	char choose;
	int val,val1;
	do{
		cout<<"1)insert new value\n";
		cout<<"2)take value\n";
		cout<<"3)exit\n";
		cin>>choose;
		cout<<endl;
		switch(choose){
			case '1':
				cout<<"insert value\n";
				cin>>val;
				ob.push(val);
				break;
			case '2':
				cout<<ob.pop()<<endl;
				break;
			case '3':
				return 0;
				val1=0;
				break;
			default:
				cout<<"no option selected!\n";
				
		}		
	}while(val1!=0);
}
//=================================================
int main(){
	stack st;
	int val;
	menu(st);
	cout<<"object doble value is...";
//object st used in expression with int val
	val=st*2;
	cout<<val<<endl;
	return 0;
}