Calculator

Build and tests status

master

---

A simple mathematical expressions evaluator written in Scala.

The calculator converts an input infix expression into the Reverse Polish notation (RPN) form using the Shunting-yard algorithm and then evaluates the postfix expression using the Postfix algorithm. Input expressions are processed case-insensitively.

Changelog

0.1 version:

• integer and floating-point numbers;
• positive and negative numbers;
• algebraic operators:
  • + addition;
  • - subtraction;
  • / division;
  • * multiplication;
• () parentheses (with no limits for nesting).

0.2 version:

• algebraic operators;
  • % modulo;
  • ^ power;
• constants:
  • pi;
  • e;
• bug fixes.

Plans for future releases:

• improve error handling (handle all types of invalid expressions with providing meaningful messages);
• extend number of operators (bit operations, ...);
• predefined mathematical functions (trigonometric: sin(x), tan(x), ...; roots: sqrt(x), root(x,y); ...);
• variables.