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Valvulator was a mobile-first music game that translated musical notes into graphics. It ran for three years before its founders realized the concept wasn’t going anywhere fast.
Thank you for contacting us with this issue. If you have paid for ad removal in the past through buying the full version, then the Restore Purchases doesn’t work for you. The reason for that is that the full version is a separate version of the app that you need to download for the App Store. The Restore Purchase is for our new model with subscriptions, but that doesn’t mean your old purchase didn’t remain intact. If this is the case then you can simply download this again from the App Store by searching for ‘Calculator Impala Studios’, or access it through this link: https://apps.apple.com/us/app/the-calculator/id396082453. You won’t be charged for this as the purchase is linked to your Apple ID. We will also make sure to still be updating and testing the full version of the app. (Source: apps.apple.com)
Most pocket calculators do all their calculations in binary-coded decimal (BCD) rather than binary. BCD is common in electronic systems where a numeric value is to be displayed, especially in systems consisting solely of digital logic, and not containing a microprocessor. By employing BCD, the manipulation of numerical data for display can be greatly simplified by treating each digit as a separate single sub-circuit. This matches much more closely the physical reality of display hardware—a designer might choose to use a series of separate identical seven-segment displays to build a metering circuit, for example. If the numeric quantity were stored and manipulated as pure binary, interfacing to such a display would require complex circuitry. Therefore, in cases where the calculations are relatively simple, working throughout with BCD can lead to a simpler overall system than converting to and from binary. (For example, CDs keep the track number in BCD, limiting them to 99 tracks.) (Source: en.wikipedia.org)