package rpn.basic;

import java.util.Hashtable;
import rpn.Calculator;

public class CopyItem extends Item {

	public CopyItem(Calculator ca) {
		super(ca);
		ca.systemInstall(this);
	}
	
	public void exec() {
		if (ca.check(1)) {
			Item a = (Item) ca.pop();
			ca.push(a.copy());
		} else {
			ca.error(this, CalcErr.Underflow);
		}
	}
	
	public String toString() {
		return("copy");
	}
}