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Strange problem with "for" and "while"

• To: mathgroup at smc.vnet.net
• Subject: [mg68359] Strange problem with "for" and "while"
• From: "LordBeotian" <pokipsy76 at ANTISPAMyahoo.it>
• Date: Wed, 2 Aug 2006 05:24:23 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

When I try to compute this:

For[k = 1, k < 10, k++,
    i := 0;
    While [k > 1, i++; k--];
    Print[i, k]]

Mathematica outputs a neverending sequence of "1,1" (and it is impossible to 
abort the computation!)

When instead I try to manually do the "for" and compute

k := ...;
i = 0;
While [k > 1, i++; k--];
Print[i, k]

giving to k all the values 1,2,...,9 the computation are all correct (the 
outputs are "01", "11", "21", ..., "81".

I cannot understand what is the problem.

• Follow-Ups:
  • Re: Strange problem with "for" and "while"
    • From: Igor Antonio <igora@wolf-ram.com>