[aPanaSoft]

Calculator Pro is a professional calculator. It supports:

1. 50+ math operations, including advanced trigonometric functions, logarithmic functions, and eight variable storage spaces.
2. Programmer calculation, hex and oct calculation, bitwise calculation, and float to/from int conversion.
3. Unit conversion, convert well known US units to metric units.
4. Function diagram: use your fingers to change range and understand how the function looks like in an easier way.
5. Canada income tax calculation
6. Tip calculation: support sale tax, number of person.

You got 6 calculation functions within one single app!

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[braindoc]

This appears to be a nice calculator with one large flaw. You can't follow what your typing on the screen. For example if you are adding 6+5, you type '6' then '+', at which the '6' disappears, then '5' then '=' and the answer appears. While calculating 6+5 isn't difficult, it is almost impossible to keep track of a longer or complex calculation. For example, how do you type in and solve 6x(5-3)/7 + 4^3?

[aPanaSoft]

the little expression on the top is to track the formula you typed in.