VisualCode

Nothing personal Gerald, I'm sure a lot of people will like it and use it but I think that's very dangerous to put such thing in the hands of people who don't understand arithmetics. 99+20% = 99.2 and any other result than that is simply heresy. If know many people have been traumatised by maths at school, but I think this will only worsen the problem. But I'm probably a math extremist. This being said, best of luck in your journey

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5yr ago

Gerald Aquila

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Maker

@samabrika1 This is a common business calculator function -- I know it's mathematically not 100% correct (I have studied mathematics for a couple of semesters), but I personally like it and it's also present in leading HP biz calculators, so I think we are on the safe side :-)

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5yr ago

J. Alexander Curtis

@samabrika1 @gerald_aquila I would agree that the way the app performs this function, matches the perceived utility to the user. If we were in an office and I verbally asked you "What is one hundred plus twenty percent?" (aka 100 + 20%), undoubtedly everyone would answer that question as 120, not 100.2.

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5yr ago

Sam Abrika

VisualCode

@gerald_aquila @_jacurtis If you ask me what's one hundred plus twenty percent, I would answer "plus twenty percent of what?". Math is a universal language with its operators, logic and rules. It is possible to define different operators, with different rules, and we actually even learn to do that during math lectures. And philosophers need to invent new words for new concepts. But here, you are just redefining addition and multiplication for people didn't get the habit of thinking in an arithmetic way. They won't even be able to calculate a discounted price in the supermarket anymore.

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5yr ago

Gerald Aquila

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Maker

@_jacurtis @samabrika1 Actually, HP redefined it (if we call it that :-). And I think the reason they thought that it is quite safe is that you actually never use something like 10+20% as 10+0.2 in the real world; if you are classically dealing with percentages, you are either adding up or subtracting percentages, or multiply or divide other values with percentages (in my opinion). But from a purely theoretical / academic point of view you are of course right.

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5yr ago

Gerald Aquila

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Maker

We always wanted to have a calculator app that puts things in context and supports calculating in a more "natural way" such as adding 20% to a price simply by typing 99+20%, or deducting a 15% discount via 99-15%. I also personally have to do calculate dates quite often, e.g., how many days from today until the end of the month: 12.31.2019-today(). We found many calculator apps, but most worked exactly the same way as the built-in calculator app, just provided a few more functions. So we built our own :-). Inseries 3 is a total rewrite in Swift with many improvements over the original versions and is available for free (ad-supported). We also have a Pro version without ads that also features a native UI experience for the iPad -- check it out and let us know what you think ;-).

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5yr ago

Gerald Aquila

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Maker

Just a quick update: we recently added auto-completion for function and constant names for the Mac version of Inseries. And BTW, Inseries Pro for iOS and Inseries for Mac are on sale right now until next Tuesday (Black Friday Sale 2021 ;-).

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3yr ago

Inseries 3

A smart, spreadsheet-like calculator app for iPhone & iPad

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