General purpose calculator 1.0

Application description
Simple calculation, easy to use, necessary calculation tools for daily life and learning
Can calculate 22-bit data, fully meet daily computing needs
Supports conversion of area, time, and more common functions (subsequent versions of temperature, length, volume, speed, weight, etc. will be added)

feature
High calculation accuracy, no rounding limit, high precision operation up to 20 digits after the decimal point
Area conversion ft2, in2, mm2, cm2, dm2, m2, acre, ha, km2, etc.
Calculation and conversion of time, day, day, hour, minute, second, millisecond, microsecond, etc.
More features follow-up development, please pay attention