- Function
- Takes one or more arguments and evaluates to a single number
- Operator
- A mathematical function that has two arguments and is written in infix notation
- Operand
- A numerical argument to an operator
- Expression
- A syntactically correct string of numbers and operators
- Result
- The evaluation of an expression
- Field
- The text area that acts as a display for expressions
- Precedence
- Determines the order of operations
The purpose of this document is to specify the requirements of the client-requested calculator. This document tries to state all necessary user and system requirements and will act as a guideline for system developers.
Compatible Platforms: Windows, Mac OS X, Linux
Language: Java SE 8
Up to 10 of the most recently evaluated expressions will be stored in a text file when the application is closed by the user. When the application is opened, that text file's existence is checked. If it exists, use it to initialize history; otherwise, start normally.
All conventional operations are supported along with the modulus operator as well. Below is a table that specifies each operation's related symbol and precedence. For precedence, 1 is the “highest”, and 3 is the “lowest”, and all operators are left associative.
| Operator | Symbol | Precedence |
|---|---|---|
| Exponentiate | ^ | 1 |
| Multiply | * | 2 |
| Divide | / | 2 |
| Modulo | % | 2 |
| Add | + | 3 |
| Subtract | - | 3 |
Each result will be a decimal number with up to 10 digits of precision.
- When one of the six conversion functions is clicked, an appropriate expression will be generated as the last expression, and the result will be displayed in the field.
- If the current expression is empty, all six conversion functions are disabled.
- If the current expression is not the last expression, the “=” button is disabled.
- The “Ans” button inserts the result of the previous calculation into the last expression.
- The “Clr” button clears all expressions and the current result, if they exist.
- The “Del” button deletes the last character in the last expression, if either exists.