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Source:
https://webdevtrick.com/basic-javascript-calculator-source-code/
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<style>
h1 {
text-align: center;
padding: 23px;
background-color: rgb(238, 236, 119);
color: rgb(14, 12, 12);
}
#clear{
width: 280px;
border: 3px solid rgb(5, 5, 5);
border-radius: 5px;
padding: 20px;
background-color: rgb(240, 85, 85)
}
.formstyle
{
width: 300px;
height: 460px;
margin: auto;
border: 5px solid rgb(6, 7, 7);
border-radius: 5px;
padding: 20px;
}
input
{
width: 20px;
height:20px;
background-color: rgb(198, 241, 198);
color: rgb(61, 60, 60);
border: 3px solid rgb(15, 14, 14);
border-radius: 5px;
padding: 26px;
margin: 5px;
margin-bottom: 2px;
font-size: 22px;
font-weight: 600;
}
#calc{
width: 250px;
background-color: beige;
font-size: x-large;
font-weight:700;
border: 5px solid black;
border-radius: 3px;
padding: 20px;
margin: auto;
}
</style>
</head>
<body>
<h1>Simple Calculator </h1>
<div class= "formstyle">
<form name = "form1">
<!-- This input box shows the button pressed by the user in calculator. -->
<input id = "calc" type ="text" name = "answer"> <br> <br>
<!-- Display the calculator button on the screen. -->
<!-- onclick() function display the number prsses by the user. -->
<input type = "button" value = "1" onclick = "form1.answer.value += '1' ">
<input type = "button" value = "2" onclick = "form1.answer.value += '2' ">
<input type = "button" value = "3" onclick = "form1.answer.value += '3' ">
<input type = "button" value = "+" onclick = "form1.answer.value += '+' ">
<br> <br>
<input type = "button" value = "4" onclick = "form1.answer.value += '4' ">
<input type = "button" value = "5" onclick = "form1.answer.value += '5' ">
<input type = "button" value = "6" onclick = "form1.answer.value += '6' ">
<input type = "button" value = "-" onclick = "form1.answer.value += '-' ">
<br> <br>
<input type = "button" value = "7" onclick = "form1.answer.value += '7' ">
<input type = "button" value = "8" onclick = "form1.answer.value += '8' ">
<input type = "button" value = "9" onclick = "form1.answer.value += '9' ">
<input type = "button" value = "*" onclick = "form1.answer.value += '*' ">
<br> <br>
<input type = "button" value = "/" onclick = "form1.answer.value += '/' ">
<input type = "button" value = "0" onclick = "form1.answer.value += '0' ">
<input type = "button" value = "." onclick = "form1.answer.value += '.' ">
<!-- When we click on the '=' button, the onclick() shows the sum results on the calculator screen. -->
<input type = "button" value = "=" onclick = "form1.answer.value = eval(form1.answer.value) ">
<br>
<!-- Display the Cancel button and erase all data entered by the user. -->
<input type = "button" value = "Clear" onclick = "form1.answer.value = ' ' " id= "clear" >
<br>
</form>
</div>
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<!DOCTYPE html>
<html>
<head>
<title>Simple Calculator</title>
<style>
body {
font-family: Arial, sans-serif;
text-align: center;
}
input[type="number"] {
padding: 10px;
width: 200px;
margin-bottom: 10px;
}
button {
padding: 10px 20px;
font-size: 16px;
background-color: #4CAF50;
color: white;
border: none;
cursor: pointer;
}
#result {
font-size: 20px;
font-weight: bold;
}
</style>
</head>
<body>
<h2>Simple Calculator</h2>
<input type="number" id="num1" placeholder="Enter number 1" /><br />
<input type="number" id="num2" placeholder="Enter number 2" /><br />
<button onclick="add()">Add</button>
<button onclick="subtract()">Subtract</button>
<button onclick="multiply()">Multiply</button>
<button onclick="divide()">Divide</button>
<h2 id="result"></h2>
<script>
function add() {
var num1 = parseFloat(document.getElementById("num1").value);
var num2 = parseFloat(document.getElementById("num2").value);
var result = num1 + num2;
document.getElementById("result").innerHTML = "Result: " + result;
}
function subtract() {
var num1 = parseFloat(document.getElementById("num1").value);
var num2 = parseFloat(document.getElementById("num2").value);
var result = num1 - num2;
document.getElementById("result").innerHTML = "Result: " + result;
}
function multiply() {
var num1 = parseFloat(document.getElementById("num1").value);
var num2 = parseFloat(document.getElementById("num2").value);
var result = num1 * num2;
document.getElementById("result").innerHTML = "Result: " + result;
}
function divide() {
var num1 = parseFloat(document.getElementById("num1").value);
var num2 = parseFloat(document.getElementById("num2").value);
if (num2 === 0) {
document.getElementById("result").innerHTML = "Result: Cannot divide by zero!";
return;
}
var result = num1 / num2;
document.getElementById("result").innerHTML = "Result: " + result;
}
</script>
</body>
</html>
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const new_div = document.createElement("div");
const new_paragraph = document.createElement("p");
const new_link = document.createElement("a");
const new_image = document.createElement("img");
// adding elements to the DOM
// selecting parent element
const container = document.querySelector(".container");
container.appendChild(new_div);
container.appendChild(new_paragraph);
container.appendChild(new_link);
container.appendChild(new_image);