Dark Time of Money

This application is a Compound (Time Value of Money) and Simple interest calculator (Savings/Loan, etc.). (Same kind calculation as [FV][PV][PMT][I%][N] key on financial calculator)
It equips User Interface suitable for Touchscreen. (Direct touch to displayed number works as number input or modification, or switching between result and input.)

(Spec)
・Compound and Simple interest calculation 3 sheets. Color-coded for your memorize help.
・Interest calculation sheet labels are selectable from 8 types.
・Simple total sheet (2 items total) and percent sheet are equipped as auxiliary.
・Number input and modification by direct touch action to the digit you want to change. In re-calculation of slight changes, entering full number is not necessary.
・Number input in keyboard sheet.
・The direction of calculation is switchable by touch. Inverse calculation, changing result field to input, is easy.
・Calculation result is automatically done at the time necessary inputs reach.
・At the pressed moment of the key, the key function is shown display. (Not the released moment.)
・Lock of each number is possible.
・Internal calculation: 16-digit decimal or fraction independently developed (Not binary floating/double)
・Display number length is selected from 10/14-digit depending on screen size.
・2 sheets can be parallelly shown and operated if screen size is larger.
・Copy / paste function of a each number and a sheet.
・2 memories
・Configurable rounding location classified 3 kinds, money/rate/amount.
・Selectable decimal point/separator character(5) and separator position(4), and number character(19).
・Automatic save of the calculation state at the application termination.
・Whole initializing. Or returning to the state at the time application started.
・Dark theme(Android10)