Calculator, no rounding errors

FEATURES:1.
Accurate, no round-off errors- Computational error (rounding-off) doesnt occur.
This app treats a numerical value as a rational number of the infinite precision.
e.g.
A result of "1 ÷ 3" is indicated as "0.3333333...", but is internally treated as "1/3" (fraction).
2.
Arithmetic operator precedence- This app understands the arithmetic operator precedence.
(e.g.
Multiplication precedes addition.) Thus, in the expression "1000 ＋ 25 × 8", the answer is "1200" (not "8200").- This app also understands parentheses.
Thus, in the expression "1 ÷ ( 2 ＋ 3 )", the answer is "0.2" (not "3.5").3.
Infinite-precision arithmetic- This app can deal with a very huge numbers or very tiny numbers without errors.- When a number is too long and doesnt fit into the display area, you can scroll the display area horizontally.- When the quotient is not divisible, it is shown up to 24 digits after the decimal point.4.
Percentage operations- You can use the "％" button to calculate a tax, etc.
e.g.
"200 ＋ 8 ％" means "200 ＋ (200 × 0.08)".
Thus, its result is "216".5.
"00" button and "000" button- You can use the "00" button instead of pressing the "0" button twice.- You can also use the "000" button instead of pressing the "0" button 3 times.
However, the "000" button is available only in the landscape mode.6.
Hardware keyboard- You can input a numerical value with the hardware numeric keypad of your terminal.- You can also input a numerical value with the hardware keyboard which is connected to your terminal.7.
Free of charge, no advertisements- You can use this app free of charge.- There is no advertisements in this app.8.
No permissions required- This app doesnt require any permissions.