UnaryOperation combines a ast::Value with an unary operator (see below ... with a binary operator (see below) ControlFlowStatement bundles statements which are able to change the flow of execution, ...

Towards the bottom, there’s a nice animated flow chart ... operators (e.g., 2^3^4 is actually ((2^(3^4)). You can also make some easy modifications to get things like unary negation and parenthesis.

This project doesn't support unary operators, so expression "-1+2" will report us "Missing operand". For the unary operator support a modified version of Shunting-yard algorithm is needed (See this ...