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Add backspace feature to remove last character from display #158

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a6cc87f
Add backspace feature to remove last character from display
Oct 6, 2025
6f51f9d
Add backspace feature to remove last character from display
Oct 6, 2025
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Binary file added c10.jpg
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66 changes: 66 additions & 0 deletions cal.css
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body{
background-image: url(c10.jpg);
background-repeat: no-repeat;
height: 100%;
width: 100%;
overflow: hidden;
background-position: center;
background-size: cover;
}
button{
width: 200px;
height: 50px;
margin: 2px 2px;
background-color: blue;
color: #fff4a7;
border-radius: 20px;
font-weight: bolder;
font-style: italic;
font-size: larger;
}
#outside{
color: white;
border-radius: 5px;
margin: auto;
margin-top: 100px;
width: 1000px;
height: 600px;
padding: 5px;
}
#heading{
margin: auto;
width: 412px;
font-size: xxx-large;
}
#btn{
margin: auto;
margin-top: 20px;
width: 815px;
}
.btn-inside{
width: 900px;
}
#val{
/* border: 2px solid red; */
height: 55px;
width: 783px;
margin-left: 100px;
color: white;
padding-left: 37px;
padding-top: 20px;
font-weight: bolder;
border:2px solid black;
}
#res{
/* border: 2px solid red; */
height: 50px;
width: 783px;
margin-left: 100px;
color: white;
padding-left: 37px;
padding-top: 25px;
font-weight: bolder;
font-size: x-large;
border:2px solid black;
}

58 changes: 58 additions & 0 deletions cal.html
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<!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">
<link rel="stylesheet" href="cal.css">
<title>Calculator</title>
</head>

<body>
<div id="outside">
<h1 id="heading">🖩CALCULATOR🖩</h1>
<div>
<div>
<h1 id="val"> </h1>
</div>
<div>
<p id="res"></p>
</div>
<div id="btn">
<div class="btn-inside">
<button onclick="adder('1')">1</button>
<button onclick="adder('2')">2</button>
<button onclick="adder('3')">3</button>
<button onclick="adder('*')">*</button>
</div>
<div class="btn-inside">
<button onclick="adder('4')">4</button>
<button onclick="adder('5')">5</button>
<button onclick="adder('6')">6</button>
<button onclick="adder('+')">+</button>
</div>
<div class="btn-inside">
<button onclick="adder('7')">7</button>
<button onclick="adder('8')">8</button>
<button onclick="adder('9')">9</button>
<button onclick="adder('-')">-</button>
</div>
<div class="btn-inside">
<button onclick="clearer()">C</button>
<button onclick="adder('0')">0</button>
<button onclick="compute(1)">=</button>
<button onclick="adder('/')">/</button>
</div>

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

<button onclick="backspace()">x</button>

</div>
</div>
</div>
<script src="cal.js"></script>
</body>

</html>
52 changes: 52 additions & 0 deletions cal.js
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let valEl = document.getElementById("val")
let resEl = document.getElementById("res")

function backspace(){
let Res = resEl.innerText;
if(Res.trim().length === 0){
let value = valEl.innerText;
let slicedValue = value.slice(0,-1);
valEl.innerText = slicedValue;
}
}
function clearer() {
resEl.innerText = "";
valEl.innerText = "";
}

function adder(k){
valEl.innerText += k
if(k=='*' || k=='+' || k=='-' || k=='/'){
compute(0)
}
}
function compute(is){
let temp = valEl.innerText, i
let t = temp[temp.length-1];
for(i=0;i<temp.length-1;i++){
if((temp[i]=='*' || temp[i]=='+' || temp[i]=='-' || temp[i]=='/') && i!=0){
break;
}
}
if(i!=temp.length-1){
let part1 = parseFloat(temp.substring(0,i));
let part2 = parseFloat(temp.substring(i+1));
let k5 = temp[i];
if(k5=='+'){
resEl.innerText = (part1)+(part2);
}else if(k5=='-'){
resEl.innerText = (part1)-(part2);
}else if(k5=='*'){
resEl.innerText = (part1)*(part2);
}else{
resEl.innerText = (part1)/(part2);
}
resEl.innerText = '= ' + resEl.innerText
if(!is){
valEl.innerText = resEl.innerText + t
if(valEl.innerText[0] == '='){
valEl.innerText = valEl.innerText.substring(1)
}
}
}
}
7 changes: 7 additions & 0 deletions readme.md
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#Create Simple Calculator using HTML, CSS and JavaScript

**Functionality**
1. Buttons to type number
2. Buttons to add, subtract, multiply and divide
3. Button to clear everything