Calculator

Web base app for performing standard mathematical computations.

Functions

Computational functions include:

• Multiplication
• Division
• Subtraction
• Addition

Additional function:

• Clear / Reset

Display

There is a two level display, one for immediate input and another for the acquired equation. The acquired equation is located at the of the display screen followed by the immediate input.

Functionality

• This Calculator can be operated by the click of Mouse, a Touch pad, the Tab button or a Numeric keypad.
• Equations containing the following elements can be evaluated:
  • Multiplication
  • Division
  • Addition
  • Subtraction
  • Negative numbers
  • Positive numbers
  • Integer numbers
  • Decimal numbers
• Integer number cannot begin with a zero.
• Decimal number cannot begin with multiple zeros before the decimal point.
• When consecutive computational operators are selected, the last operator is used (excluding the negative (-) sign).
• Selecting a computational operator after an equal operator will start a new equation containing the result from the previous equation.
• Selecting a decimal point after an equal operator will start a new equation containing a decimal starting with a zero (0.).
• Formula logic is used for this Calculator's logic, where order of operation precedence is observed.

Implementation

The following languages, framework and libraries were used in the creation:

• Html5
• Css3
  • Grid box (for layout and responsiveness)
• JavaScript ES6
• React
• mathjs
• create-react-app

Screenshot

Credit

• created by Nial Hope
  • Portfolio

Acknowledgement

Thank you to Freecodecamp.org for the project idea.

License

Calculator is an open source software licensed as GNU General Public License v3.0