Merge branch 'rtoy-issue-82-replace-bc' into 'master'

Fix #82: Replace bc with expr

Closes #82

See merge request !50
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canceled linux-runner #3065
linux

00:00:44

passed osx-runner #3019
osx

00:08:57

failed linux-runner #3064
linux

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passed linux-runner #3018
linux

00:04:32