Speech calculator

Developed as a project for Natural Language Technologies course by Anatole Gershman, 2015

The typical calculator request is spoken in a form mathematical expressions. It's also very important that word order usually follows the order of evaluation: “five minus two” → 5-2 “square root of nine” → sqrt(9) “one thoursand seven hundred and eleven divided by three” → 1711 / 3 However, some changes may occur: “five plus seven multiplied by three” → (5+7)*3 “square root of five plus three point one” → sqrt(5+3.1) “subtract twenty five from ninety” → 90 – 25

The following operators have been implemented: addition ('plus', 'плюс', 'at') subtraction ('minus', 'минус') multiplication('multiplied', 'times', 'умножить') division('divi*', 'over', 'дел*')

The following functions (unary and binary) have been implemented: addition ('add', 'сложить', 'at') subtraction ('subtract', 'вычесть') multiplication('multiply', 'умножить') division('divi*', 'дел*') square root ('root', 'корень') logarithm('logarithm', 'логарифм') sine('sine', 'sign', 'синус') cosine('cosine', 'косинус') tangent('tangent', 'тангенс')