carlos-i-martinez / codepen-javascriptcalculator

JavaScript Calculator

A CodePen.io App that functions as a regular calculator created with javascript code.

Project 4 of 5 for freeCodeCamp's Front End Libraries Developer Certification.

Public Webpage: JavaScript Calculator.

A Pen created at CodePen.io. You can find this one at https://codepen.io/carlos-i-martinez/pen/GeLEYN

Completed Front End Libraries Certification: Certificate.

FreeCodeCamp Public Profile: Carlos Martinez FreeCodeCamp

Technologies Used:

• HTML, JavaScript, CSS, Bootstrap and JQuery.

Some requirements to complete project:

• Calculator should contain clickable buttons for numbers 0 to 9.

• Calculator should contain clickable buttons for equals, divide, multiply, add, subtract, decimal point(.) and clear.

• As number buttons are clicked, they should be displayed in the calculator.

• In any order, should be able to add, subtract, multiply and divide a chain of numbers of any length, and when 'equals' '=' is clicked, the correct result should be displayed.

• When inputting numbers, calculator should not allow a number to begin with multiple zeros

• When the decimal element is clicked, a . should append to the currently displayed value; two . in one number should not be accepted.

• I should be able to perform any operation (+, -, *, /) on numbers containing decimal points.

• If 2 or more operators are entered consecutively, the operation performed should be the last operator entered.

• Pressing an operator immediately following = should start a new calculation that operates on the result of the previous evaluation.

• Calculator should have several decimal places of precision(at least 4 decimal places)

• Calculator utilizes formula logic and observes order of operation precedence.