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Syntax:
cond {clause}* => result*
clause::= (test-form form*)
Arguments and Values:
test-form---a form.
forms---an implicit progn.
results---the values of the forms in the first clause whose test-form yields true, or the primary value of the test-form if there are no forms in that clause, or else nil if no test-form yields true.
Description:
cond allows the execution of forms to be dependent on test-form.
Test-forms are evaluated one at a time in the order in which they are given in the argument list until a test-form is found that evaluates to true.
If there are no forms in that clause, the primary value of the test-form is returned by the cond form. Otherwise, the forms associated with this test-form are evaluated in order, left to right, as an implicit progn, and the values returned by the last form are returned by the cond form.
Once one test-form has yielded true, no additional test-forms are evaluated. If no test-form yields true, nil is returned.
Examples:
 (defun select-options ()
   (cond ((= a 1) (setq a 2))
         ((= a 2) (setq a 3))
         ((and (= a 3) (floor a 2)))
         (t (floor a 3)))) =>  SELECT-OPTIONS
 (setq a 1) =>  1
 (select-options) =>  2
 a =>  2
 (select-options) =>  3
 a =>  3
 (select-options) =>  1
 (setq a 5) =>  5
 (select-options) =>  1, 2
 
Side Effects: None.
Affected By: None.
Exceptional Situations: None.
See Also:
Notes: None.
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