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© 2025 Hassan El-Sheikha

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  1. Writing Varphi Programs
  2. More Examples

Coin Flip

Below is an example of a nondeterministic Varphi program that, when given an input tape containing exactly one tally, returns an output tape containing one or two tallies. 

qStart 1 qHeads 0 R
qStart 1 qTails 0 R

qHeads 0 qWrite1 0 R
qTails 0 qWrite2 0 R

qWrite1 0 qHalt 1 R
qWrite2 0 qWrite1 1 R

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