![]() ![]() RPN accounts for the order and precedence of the mathematical operators involved in the symbolic mathematical expression. The shunting yard algorithm converts the symbolic mathematical expression into a reverse polish notation (RPN). Here is the SYA algorithm (C#) - I am using it to build the AST, then traverse it in post order and feeding the postfix into this RPN algorithm to do the calculations. The symbolic mathematical expression is parsed 409 using a standard algorithm such as the shunting yard algorithm. I'm treating '!' and "_" as unary operators, with '_' signifying an unary minus - also the ^ is to raise by power, and I know this is not ideal but I'm using it for now. Features of the Shunting Yard Algorithm program This is a Java Program to Implement Shunting Yard Algorithm. A java infix evaluator based on Shunting Yard algorithm. Is this a bad way of doing things? It's just an all-in-one approach - here are the precedences: , mXparser - Math Parser Java C Library mXparser is highly flexible parser of math expressions. ![]() However, as I want to make a general 'expression resolving' algorithm for anything in my language, I've modified it to calculate logical, string-based or numerical results. It works out mathematical expressions as it should and as far as I know, it is fully functioning. So I've already implemented a basic shunting yard algorithm that takes into account unary minus, etc. ![]()
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