the question is: suppose I have an input function like sin(2-cos(3*A/B)^2.5)+0.756*(C*D+3-B) specified with a BNF, I will parse input using recursive descent algorithm, and then how can I use or chang
Let\'s say a User has many Documents, and a single Document they\'re currently working on. How do I represent this in rails?
加载中,请稍侯......