Calculator

A simple calculator, the display of which indicates expressions and gives easy operation for editing.
The calculator PanecalST includes features below:
*Four arithmetic operations, root, percentages, and tax calculations
*Calculations with parentheses
*Memory, M+, M-, MR, MC
*Scroll up/down lines
*Easy editing by using a cursor operation
*Cut, copy, and paste
*Expressions history and answer history
*Configurable grouping separator and decimal point

　
Four arithmetic operations:
1 + 2 - 3 × 4 ÷ 5 = 0.6
　
Root:
√( 2 × 2 ) = 2
　
Percentages:
500 + 20% = 600
500 - 20% = 400
500 × 20% = 100
100 ÷ 500% = 20
　
Tax calculation:
500 Tax+= 525
525 Tax-= 500
　
Parentheses:
( 1 + 2 ) × ( 3 + 4 ) = 21
( 1 + 2 ) ( 3 + 4 ) ( 5 + 6 ) = 231
　
Grouping separator and decimal point:
123,456,789.1 + 0.02 = 123,456,789.12
123.456.789,1 + 0,02 = 123.456.789,12
(Depends on setting)
　
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