Scientific Calculator

This tool provides a browser-based scientific calculator designed to handle arithmetic, algebra, trigonometry, logarithms, exponentiation, and root operations. It accepts standard mathematical notation, including nested parentheses, and returns numeric results with consistent precision. It is intended for students, engineers, researchers, and educators who require a fast, portable calculator without installing software.\n\nConceptually, the system follows a three-stage model: parse the input into tokens, convert infix expressions to an internal representation using a shunting-yard algorithm, then evaluate the resulting structure with a stack-based calculator. Functions such as sin, cos, tan, asin, log, ln, sqrt, and constants pi and e are resolved at runtime; degree/radian mode governs angle calculations. The parser supports operator precedence, associativity, unary minus, and parentheses, ensuring correct results for nested expressions and edge cases.\n\nCore features are explicit and modular: a robust evaluator, strict error handling for division by zero and domain errors, support for unary minus and exponentiation, and optional memory functions to store and recall numbers during a session. Optional enhancements include percent, factorial, and auto-formatting to readable decimal strings.\n\nUse cases span classroom exercises, quick verification of results in problem sets, engineering calculations, and data analysis checks. The tool differentiates itself by combining a compact, fast evaluation engine with clear numeric outputs and configurable modes, enabling accurate comparisons against hand calculations and software CAS in routine workflows.\n\nThe tool provides reliable, portable computation across contexts, from study sessions to professional notebooks, without requiring installation or network-dependent features beyond a standard browser.