The calculator allows you to:
- To perform mathematical operations (addition, subtraction, multiplication and division);
- Perform trigonometric calculations;
- Power;
- Extraction degree;
- The factorial;
- Calculation of logarithms;
- Preserve the history of computing after closing calculator.

In addition, the calculator allows you to summarize the results of using the history of computing.

For the history of computing hold your finger on the output result.
To sum up the results of the necessary they need to highlight in the history list.

To clean the history of computing is necessary to keep a finger on the title "History" and answer "Yes" to the proposal to delete the history.

Added theme.