This project represent Asbstract Syntax Tree as Composite Data Structure. It contains list of useful tests to get 100% coverage. It has base class of Node with pure virtual method evaluate Terminal class derive from Node class to override evaluate. This class represent single number. NonTerminal class repssent simple expression such as 3 + 4, 5 /7. This class takes two Nodes. left and right. Node can be Terminal or NonTerminal. All OP class derive from NonTerminal which takes two left and right node. PlusOP class evaluate using addtional operator. MinusOP class evaluate using subtraction operator MultiOP class evaluate using multiple operator DivideOP class evaluate using divide operator Unit tests for each operation and few complex expression evaluation.