Create A Calculator Using HTML, CSS & JavaScript

Here is HTML, CSS and JavaScript code to create a basic web calculator.

Copy the code from GitHub

 

HTML Code:


<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge">

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<title>Calculator</title>

<link rel="stylesheet" href="style.css">

</head>

<body>

<div class="calculator">

<input type="text" id="display">

<button onclick="deleteVal()">C</button>

<button onclick="deleteChar()">CE</button>

<button onclick="add('%')">%</button>

<button onclick="add('/')">/</button>

<button onclick="add('7')">7</button>



<button onclick="add('8')">8</button>

<button onclick="add('9')">9</button>

<button onclick="add('*')">*</button>

<button onclick="add('4')">4</button>

<button onclick="add('5')">5</button>

<button onclick="add('6')">6</button>

<button onclick="add('-')">-</button>

<button onclick="add('1')">1</button>

<button onclick="add('2')">2</button>

<button onclick="add('3')">3</button>

<button onclick="add('+')">+</button>

<button onclick="add('0')">0</button>

<button onclick="add('00')">00</button>

<button onclick="add('.')">.</button>

<button onclick="calculate()" id="equal">=</button>



<script src="script.js"></script>







</div>

</body>

</html>

 

 

CSS Code: 


body{
    box-sizing: border-box;
    margin:0;
    padding:0;
    display:flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: rgb(8,110,111);
    background: linear-gradient(140deg, rgba(8,110,111,1),rgba(56,9,121,1)100%);
}
.calculator{
    width: 300px;
    padding: 20px;
    background-color: #1f0033;
    box-shadow: 0 0 10px rgba(0,0,0, 0.6);
    border-radius: 10px;
}
button{
    width: 50px;
    height: 50px;
    margin: 10px;
    font-size: 20px;
    border: none;
    border-radius: 5px;
    background-color: #a1a1a1;
    cursor: pointer;

}
button:hover{
    background-color: #ddd;
}
#equal:hover{
    background-color: rgb(2,245,2);
}
button:active{
    background-color: rgb(100,100,100);
}
#equal:active{
    background-color: rgb(0,80,0);
}
#display{
    width: 90%;
    margin-bottom: 10px;
    padding: 10px;
    border: none;
    border-radius: 5px;
    font-size: 25px;
    text-align: right;
} 

JavaScript Code:

let display = document.getElementById('display');

function add(val){
    display.value  += val;
}
function deleteVal(){
    display.value ='';
}
function deleteChar(){
    display.value= display.value.slice(0,-1);
}
function calculate(){
    display.value= eval(display.value);
}

 



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