Scientific Calculator

Full-featured scientific calculator with expression input, multiple modes (Standard, Scientific, Programmer, Statistics, Physics, Chemistry), memory functions, scientific constants, and an interactive button interface.

This is a general-purpose expression calculator: type something like sin(45), 2^10, or sqrt(16) directly into the Expression field, and it is parsed and evaluated as a whole rather than built up one button press at a time. Six specialized modes reshape which secondary functions and quick-access buttons are emphasized — Standard, Scientific, Programmer, Statistics, Physics, and Chemistry — and every mode routes the typed expression through the identical parsing and evaluation logic underneath, with one exception: Programmer mode additionally floors the computed result to a whole number before displaying it, so an expression like sqrt(2) reads 1.41421 in Scientific mode but just 1 in Programmer mode, even though the underlying evaluation was identical. Because the primary input is open-ended text rather than a small set of numeric sliders, there is no single field whose influence dominates the output the way a slider-driven calculator's default input does — the result depends entirely on what you type. Angle mode matters only for trigonometric functions: with Degrees selected, sin, cos, and tan are wrapped so the argument is converted from degrees to radians before evaluation, matching how a physical calculator behaves, and inverse trig results are converted back to degrees afterward; with Radians selected, no conversion is applied in either direction. Recognized constants — pi, the golden ratio phi, and e — are substituted before the expression is evaluated, and any unmatched open parenthesis left at the end of what you typed is closed automatically rather than rejected as invalid. Left unaddressed here: Programmer mode's binary, hexadecimal, and octal readouts are only populated for a non-negative result — a negative outcome leaves all three fields blank rather than showing a signed representation, and the parser has no support for user-defined variables carried between separate expressions.