I have implemented an RPN calculator in python but now I would like to make the stack size fixed. how can I transform the user's RPN expression from a stack overflow to a computable expression.
For instance, if my stack size is 2 then the some expression can't be computed but could be transformed as following: Non computable expression: 1 2 3 + + --> stack size of 3 is needed Computable expression: 1 2 + 3 + --> stack size of 2 is needed How can I define a formal way of transforming the non computable expression to computable one. My RPN only implements: + - x % -- http://mail.python.org/mailman/listinfo/python-list
