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Version: Sprint 4

settapecount

Sets the number of tapes for multi-tape variants.

Syntax​

settapecount(n);

Parameters​

  • n: A positive integer (1, 2, 3, ...)

Examples​

setvariant(multi-tape);
settapecount(2);  ### Two-tape machine
setvariant(multi-tape-multi-step);
settapecount(3);  ### Three-tape machine

Rules​

  • Only valid for multi-tape variants: multi-tape and multi-tape-multi-step
  • Required when using multi-tape variants
  • Must be a positive integer
  • Must appear before declarations and transitions
  • Can only be declared once

Examples by Variant​

Not allowed (single-tape):

setvariant(single-tape);
settapecount(2);  ### ERROR: 'settapecount' is not valid for variant 'single-tape'

Required (multi-tape):

setvariant(multi-tape);
### ERROR if settapecount is missing: 'setvariant(multi-tape)' requires an explicit 'settapecount'

Correct:

setvariant(multi-tape);
settapecount(2);

Errors​

  • Invalid number: tape count must be a positive integer, got 'xyz'
  • Wrong variant: 'settapecount' is not valid for variant 'single-tape'
  • Missing for multi-tape: 'setvariant(multi-tape)' requires an explicit 'settapecount'
  • Duplicate: duplicate 'settapecount'

See Also​