Fundamentals of Computer Science I: Media Computing (CS151.02 2007F)

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Related Courses: [CSC151.01 2007F (Davis)] [CSC151 2007S (Rebelsky)] [CSCS151 2005S (Stone)]

rgb?

Procedure rgb?
Parameters val, a Scheme value
Purpose Determine whether the value is an RGB color.
Produces is-rgb, a Boolean value
Preconditions (None)
Postconditions is-rgb is true (#t) if val can be interepreted as an RGB color
is-rgb is false (#f) otherwise.
Practica 
  > (rgb? (rgb.make 10 10 10))
  #t
  > (rgb? "red")
  #f

 

[Skip to Body]
Primary: [Front Door] [Glance] - [Academic Honesty] [Instructions]
Current: [Outline] [EBoard] [Reading] [Lab] [Assignment]
Groupings: [Assignments] [EBoards] [Examples] [Exams] [Handouts] [Labs] [Outlines] [Projects] [Readings] [Reference]
Reference: [Scheme Report (R5RS)] [Scheme Reference] [DrScheme Manual]
Related Courses: [CSC151.01 2007F (Davis)] [CSC151 2007S (Rebelsky)] [CSCS151 2005S (Stone)]

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Samuel A. Rebelsky, rebelsky@grinnell.edu
Copyright © 2007 Janet Davis, Matthew Kluber, and Samuel A. Rebelsky. (Selected materials copyright by John David Stone and Henry Walker and used by permission.) This material is based upon work partially supported by the National Science Foundation under Grant No. CCLI-0633090. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.