This calculator has the configuration of a basic calculator.
It has 28 keys with 7 main operations (addition, subtraction, multiplication, division, percentage, square root and multiplicative inverse).
By default, it uses the decimal format for the numbers between -10E10 and 10E10 and the scientific format for numbers out of this range. This limits depend on the selected configuration. The higher number is 1.7976931348623157E308 (in absolute value).
The color of the screen and the color of each group of keys can be changed in the configuration. There are more than 68 millions of combinations.
The upper side of the screen is the secondary screen. It is a scrollable screen that shows the log of the operations. It can be deactivated in the configuration.
It is possible to select a different set of digits for the keyboard and/or for the screen. The first version of this app includes the numeral systems: Western Latin, Arabic, Persian, Chinese/Japanese, Devanagari (languages: Hindi, Marathi, Nepali, Sindhi, etc.), Thai, Tamil, Bengali or Bangla, Telugu, Kannada, Malayalam, Gurmukhi (language: Punjabi), Gujarati, Oriya, Lao, Khmer, Burmese and Tibetan. Your phone could support only some of them. The unsupported ones can be shown as question marks or something similar.
User has to take into account that the new set replaces the set 0123456789 digit by digit. Not all of available sets can be used correctly on screen. For instance, using the Japanese language set, the number 100 will be displayed as 一〇〇 but the correct codification is 百 (only one digit). The same problem could happen with other sets of digits.