A simple program to show basic math operations like addition, subtraction, multiplication, and division of two numbers using JavaScript programming language.
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Program Listing
<!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>BASIC MATH OPERATIONS IN JAVASCRIPT</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background-color: #EEEDED;
color: #333;
font-family: sans-serif;
}
main {
padding: 50px;
border-radius: 10px;
background-color: #fff;
min-width: 500px;
}
h1 {
margin-bottom: 5px;
font-size: 28px;
text-align: center;
}
h2 {
margin-bottom: 20px;
font-size: 20px;
text-align: center;
}
.block {
margin: 12px auto 0;
display: flex;
align-items: center;
width: 100%;
}
label {
display: flex;
align-items: center;
justify-content: center;
width: 35%;
line-height: 40px;
background-color: #434343;
color: #fff;
height: 45px;
}
input,
select {
padding: 10px;
width: 65%;
font-size: 14px;
border-radius: 0 5px 5px 0;
border: 2px solid #434343;
outline: none;
height: 45px;
}
.btn {
display: inline-block;
padding: 15px;
background-color: #FF3D57;
color: #fff;
outline: none;
border: none;
cursor: pointer;
width: 150px;
width: 50%;
font-size: 16px;
text-decoration: none;
text-align: center;
transition: all .2s;
}
.btnReset {
background-color: #FFCA00;
}
.btn:hover {
opacity: 0.9;
}
.output {
display: block;
width: 100%;
margin-top: 12px;
padding: 20px 0;
background-color: #434343;
font-size: 16px;
text-align:center;
color: #fff;
}
.hide {
display: none;
}
</style>
</head>
<body>
<main class="container">
<h1>BASIC MATH OPERATIONS IN JAVASCRIPT</h1>
<h2>Jake R. Pomperada, MAED-IT, MIT</h2>
<form action="" id="frmCalc">
<div class="block">
<label for="grade1">First Number:</label>
<input type="number" id="number1" required autofocus>
</div>
<div class="block">
<label for="grade2">Second Number:</label>
<input type="number" id="number2" required>
</div>
<div class="block">
<label for="operator">Select Operator:</label>
<select id="operator" required>
<option value="Add">Add</option>
<option value="Subtract">Subtract</option>
<option value="Multipy">Multipy</option>
<option value="Divide">Divide</option>
</select>
</div>
<div class="block">
<button type="submit" class="btn">CALCULATE</button>
<a href="" class="btn btnReset">RESET</a>
</div>
<div class="output hide"></div>
</form>
</main>
<script>
document.querySelector('#frmCalc').onsubmit = (e) => {
e.preventDefault()
let calc = document.querySelector('.output'),
operator = document.querySelector('#operator').value,
numbers = document.querySelectorAll(`[id*="number"]`),
total = 0, message;
switch (operator) {
case 'Add':
total = parseInt(numbers[0].value) + parseInt(numbers[1].value)
message = "The Sum is: "
break;
case 'Subtract':
total = parseInt(numbers[0].value) - parseInt(numbers[1].value)
message = "The difference is: "
break;
case 'Multipy':
total = parseInt(numbers[0].value) * parseInt(numbers[1].value)
message = "The product is: "
break;
case 'Divide':
total = parseInt(numbers[0].value) / parseInt(numbers[1].value)
message = "The qoutient is: "
break;
}
calc.classList.remove('hide')
calc.innerHTML = message+total.toFixed(2)
}
</script>
</body>
</html>
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