竖式计算器 - Vertical Calculator

- Easy to use (calculator-like interface).
- Support addition, subtraction, multiplication and division operations.
- Support decimal point.
- Detect repeating decimal in division operation, and display repetend when the length of decimal part less than 30 digits.
- The result page supports gesture zoom for easy viewing.
- Support exporting result as image or PDF file.
- Support iPad Multitasking
- Support Physical Keyboard