Let outputUpper = document.querySelector('#upper') upper output is for showing the expression Select both of them using the querySelector method. In the HTML part, you can see there are 2 output elements. Let's now write javascript code for the calculator. Now, we need to create the JavaScript code to make the calculator work. We have completed the design of the calculator. Here is the complete HTML code of the calculator. Also, add font-awesome icons to the HTML file. With different orders, we can create different layouts of the calculator.įinally, connect the CSS and Javascript files to the HTML file. In the above code, you can see the buttons are in a certain order because we want our buttons to be in specific places. Also, attach onclick event to all these buttons with a javascript function. The input element will contain all kinds of input buttons we can have like, numbers, operators, clear, brackets, etc. The first one is called upper output, which displays the expression, and the second one is called lower output, which displays the result. The output element will further contain 2 pre elements. Now, inside the calculator container, create 2 div elements one to display the result and another to display the input. This div element will be our calculator container. To start with first create a container (a div element with a class container) and inside it create another div element with a class calculator. So, let's start creating the structure of our calculator. You can always modify the structure later. When you create the structure of anything in HTML, the structure need not be perfect in the first attempt. HTML - Creating the structure of the calculator First, the structure of the calculator will be created (using HTML), then we will style it (using CSS), and finally, we will create the logic of the calculator (using JavaScript).ġ. We will start building our calculator step by step. JavaScript (script.js) - To create the logic of the calculator.CSS (style.css) - To style the calculator.HTML (index.html) - To create the structure of the calculator.Let's start creating our simple calculator. Test the appĪ simple calculator is used to perform simple mathematical calculations like addition, subtraction, multiplication, and division. Then, the switch statement executes cases based on the user input.Before proceeding further let's have a look at what we are going to build. In above program, the user is asked to enter either +, -, * or /, and two numbers. The if.else if.if statement is used to check the condition that the user has entered for the operator. The corresponding operation is performed and the output is displayed.Įxample 2: Simple Calculator with switch // program for a simple calculatorĬonst operator = prompt('Enter operator ( either +, -, * or / ): ') Ĭonst number1 = parseFloat(prompt('Enter first number: ')) Ĭonst number2 = parseFloat(prompt('Enter second number: ')) Ĭonsole.log(`$`)
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