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While

While
evaluates test, then body, repetitively, until test first fails to give True.
MORE INFORMATION
  • While[test] does the loop with a null body.
  • If Break is generated in the evaluation of body, the While loop exits.
  • Continue exits the evaluation of body, and continues the loop.
  • Note that in an example like the roles of and are reversed relative to C-like programming languages.
EXAMPLESCLOSE ALL
Basic Examples   (1)
Print and increment n while the condition n<4 is satisfied:
Print and increment n while the condition n<4 is satisfied:
In[1]:=
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Scope   (2)
The body can be included as part of the test:
Break breaks out of the While:
Generalizations & Extensions   (1)
Test the condition during or at the end of the loop:
Applications   (2)
Compute the GCD of two numbers:
Count the number of iterations in a fixed-point calculation:
Properties & Relations   (4)
If the test is False, the body is never evaluated:
While returns Null:
Use Print to see the iterations:
Do iterates a fixed number of times:
NestWhile is a functional form of While:
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