simple calculator in javascript || 2024
The provided code creates a simple web-based calculator using HTML and JavaScript. The calculator includes a display and buttons for digits, basic arithmetic operations, a clear function, and an evaluation function.
The head section of the code contains meta tags for character set and viewport settings, and it links to an external CSS file for styling. The body section contains the main content of the calculator.
A form is used to structure the calculator. The form is given an ID "cal-form" and a name "calculator" and has an onsubmit attribute set to "return false;" to prevent traditional form submission, allowing for JavaScript handling instead.
Within the form, there is a div with a class "display" that contains a readonly input field. This field is used to show the user's input and the calculation results.
The buttons are grouped within a div with a class "button-group." Each button has an onclick attribute that appends its respective value to the display. Numeric buttons (0-9) and basic operators (+, -, *, /) add their values to the display input field. The "C" button clears the display, and the "=" button evaluates the expression in the display using the eval function. This function parses and executes the string as a mathematical expression.
Overall, the code combines HTML for structure and JavaScript for functionality to provide the basic features of a calculator.