Problems with a shunting yard algorithm

Question

I have successfully implemented a shunting yard algorithm in java. The algorithm itself was simple however I am having trouble with the tokenizer. Currently the algorithm wo

Answer 1

The answers to this question might be helpful.

In particular, one of those answers references a solution in C that handles unary minus.

Basically, you have to recognize a unary minus based on the appearance of the minus sign in positions where a binary operator can't be, and make a different token for it, as it has different precedence.

Dijkstra's original paper doesn't too clearly explain how he dealt with this, but the unary minus was listed as a separate operator.