Two files be placed , to certain composition of (warehouse of) simple project entering, template calculates inclusive < include (reach; make) > Array and it operation of template with (from) method several instructions of codes ( ) demonstrating main. Task relies on making of new template representing calculator, be based on data template of container Array. Calculator accepts next elements of arithmetic formulations recorded (written down) in (to) reverse polish ( _ _ polish < poland > ) notacji http://pl.wikipedia.org/wiki/Odwrotna notacja and value of this formulation calculates on currently. Calculator has methods it add ‘ ’, which (who) introduces element of formulation for next container and ‘ show ’, which (who) returns value of element on end of formulation currently finding (be placed) ( but it does not delete he (it) of formulation ). It accept, that there can be operators in arithmetic formulation only +, -, * or /, however, arguments - value optional type numerical.