10 Essential Features Every Console Calculator Should Have
1. Clear, minimal text UI
- Single-line input prompt and concise output.
- Use consistent formatting for numbers, operators, and results.
2. Basic arithmetic operations
- Addition, subtraction, multiplication, division.
- Correct operator precedence and left-to-right associativity.
3. Parentheses and nesting
- Support for nested parentheses and balanced-paren validation.
- Informative error message for mismatches.
4. Floating-point and integer handling
- Precise control over floating-point precision and rounding.
- Option to toggle integer-only mode or big-integer support.
5. Unary operators and functions
- Unary plus/minus, percentage, factorial, absolute value.
- Built-in math functions: sqrt, pow, sin, cos, tan, log, exp.
6. Memory and variables
- Memory store/recall (M+, M-, MR, MC) and simple variable assignment (e.g., a=5).
- Persistent variables per session.
7. History and undo
- Command history with navigation (up/down arrows) and recall.
- Ability to undo last operation or edit previous entry.
8. Robust input parsing and validation
- Tokenization, error detection for invalid tokens, division by zero checks.
- Helpful error messages pointing to the problem position.
9. Extensibility and scripting
- Support for custom functions/macros and importing user-defined scripts.
- Plugin-friendly architecture or simple DSL for extensions.
10. Portability and performance
- Cross-platform compatibility and lightweight resource usage.
- Fast evaluation for large expressions and benchmarked performance options.
Optional extras: REPL-friendly prompts, configurable precision/display formats, unit-aware calculations, and accessibility (keyboard navigation, screen-reader labels).
Leave a Reply