To evaluate a postfix expression, you need a stream of tokens and a stack that holds tokens. To evaluate an expression like 2 3 +, you read in the tokens one at a time, from left to right, and apply ...

To evaluate a postfix expression, you need a stream of tokens and a stack that holds tokens. For example, to evaluate 2 3 +, you read in the tokens one at a time, from left to right, and apply the ...