SEARCH MATHEMATICA 8 DOCUMENTATION

THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION.

Mathematica > Core Language > Procedural Programming > Looping Constructs >

Built-in Mathematica Symbol

While

While[test, body]
evaluates test, then body, repetitively, until test first fails to give True.

Note that in an example like i=0;While[i<0, tot+=f[i];i++] the roles of ; and , are reversed relative to C-like programming languages.

Print and increment n while the condition n<4 is satisfied:

The body can be included as part of the test:

Break breaks out of the While:

Test the condition during or at the end of the loop:

Compute the GCD of two numbers:

Count the number of iterations in a fixed-point calculation:

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: