Xzfracal for hand-held devices (Android or BlackBerry) has 66 keys for entering numbers, basic binary operations, editing and evaluating input expressions. The keys are arranged as 2 palettes, each consisting of keys arranged in a uniform grid of 3 rows and 11 columns, providing a total of 66 keys, 2 of which are dedicated for keyboard-palette navigation.
| If the keys of your keyboard is too small, please try switching to the landscape mode. |
C1. Home keyboard
The first palette is the home keyboard, as suggested by its icon.
This palette holds the most basic keys:
- The 10 digit keys for entering numbers: 0,1,2,...,9.
- 5 keys for decorating numbers:
- '.' decimal point.
- ':' delimiter for fraction and mixed fraction.
- '&' marker for a group of repeating decimals.
- '@' exponent for scientific notation.
- '_' spacer for enhancing readability of numbers.
- The backspace and delete key for erasing one character, and the clear-all key for erasing the entire input.
- The forward and backward cursor movement keys.
- 1 keyboard-palette navigation key.
- The 4 keys for basic arithmetic operations, and additional keys for other operations.
- 1 key for accessing the history stack of calculation.
- 2 keys for entering pairs of matching parentheses and brackets.
- The comma key for separating arguments in function calls.
- The execution key, which signals Xzfracal to compute (evaluate) the input.
When you press the '()' or '[]' key, Xzfracal automatically enter a pair of matching parentheses or brackets for you, and move the cursor to inside, so you can continue building your expression without worrying the balancing of parentheses or brackets. This behavior should facilitate your inputting an expression. You should be able to enter most simple mathematical expressions, and correct occasional typos using the home keyboard only. When you are done, just press the gold key (the one with a equal sign '=' on it) at the lower-right corner to signal Xzfracal to evaluate the input. This key is represented by CALC in this guide. Should you need extra functionality, just press the keyboard-palette navigation keys.
C2. Secondary keyboard
The second palette is the secondary keyboard, its icon consists of the alphabets.
This palette holds the alphabet keys and additional operator keys:
- The 26 alphabet keys for entering function names.
- The space, which is used to enhance the readability of input expression. It has no real significance.
- Additional operator keys.
- 1 keyboard-palette navigation key.
