What is the Simple Spreadsheet application, how does it work?

According to the introduction of iku, Simple Spreadsheet is a Productivity app on the Android platform. There is currently a 2.2.2 version released on Oct 22, 2017, you can see the details below.

"Simple Spreadsheet" is an intuitive and very easy to use spreadsheet application specialized for smartphones and tablet devices. It can be used instead of a calculator, and be available for simple summary work such as household account book and gaming point record, schedule memo etc.
Available function, calculation and their example are as follows.
・Four arithmetic operations
　ex) =C2R2*(C2R3+C2R4)/4-10
・Sum function
　ex) =sum(C1R1:C3R4)
・Average function
　ex) =average(C1R1:C3R4)
・Max function
　ex) =max(C1R1:C3R4)
・Min deviation function
　ex) =min(C3R1:C5R4)
・Trigonometric function
　ex) =sin(3/2*pi())
　　　=tan(0.5*pi())
・Exponential function
　ex) =power(3,5)
・Logarithmic function
　ex) =log(2,C6R1)
・Absolute function
　ex) =abs(-5)
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- Some bugs are fixed.