Conditionals Reference

(and exp₁ exp₂ ... exp_n): Standard keyword. Evaluate each expression in turn. If any of those values is false, return false. Otherwise, return the value of the last expression.
(cond (test₁ consequents₁) (test₂ consequents₂) ... (test_n consequents_n) (else alternative)): Standard keyword. Evaluate each test in turn until one is truish. It then evaluates the corresponding sequence of consequent expressions and returns the value of the last consequent. If none of the tests is truish, evaluates the alternative and returns its value.
(or exp₁ exp₂ ... exp_n): Standard keyword. Evaluate each expression in turn. If any of those values is true, return true. Otherwise, return the value of the last expression.
(if test consequent alternative): Standard keyword. Evaluate test. If its value is truish (that is, anything but false), evaluate consequent and return its value. If the value of test is false (#f), evaluate and return alternative.

Primary: [Front Door] [Syllabus] - [Academic Honesty] [Instructions]

Current: [Outline] [EBoard] [Reading] [Lab] [Assignment]

Groupings: [Assignments] [EBoards] [Examples] [Exams] [Handouts] [Labs] [Outlines] [Projects] [Readings]

References: [A-Z] [Primary] [Scheme Report (R5RS)] [Scheme Reference] [DrScheme Manual]

Misc: [SamR] [DrFu] [GIMP] [DrScheme]

Samuel A. Rebelsky, rebelsky@grinnell.edu

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.