http://monsoonwok.com/plt-cross/
Plt Cross
Can declare variables PLT SCHEME long term and if so how?
I began to learn in an introduction to PLT Scheme "to programming "class last year, and taught me how to declare variables cross-function, which is one of the most powerful features a programming language. I would like to continue learning scheme, but I can do anything I want without variables function cross – I mean, try not to lose view the coordinates of an image, or the health of a multiple video game "enemies", or even get user input without creating variables. If possible, is extremely difficult, and the plan should be taught to students who know a language based on C, Java or C + + or Objective-C or just C, first, more than a language used to introduce programming in general. But enough detail – SYSTEM can declare variables?
Yes, you can – but your question is not clear about what really try to do. It's probably best to ask on the mailing list Racket – http://racket-lang.org/community.html see. (Racket is the new name of PLT Scheme.)
