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CALCULATOR.HTML
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
body {
background-color: aqua;
}
.lowbtn {
margin-top: 5px;
}
.btnline1 button {
margin: 2px;
}
.btnline2 button {
margin: 2px;
}
.btnline3 button {
margin: 2px;
}
</style>
<body>
<div class="upbtn">
<div class="txtbox">
<input type="text" id="display" >
<button onclick="clearDisplay()">C</button>
<BUTton onclick="removeOne()">X</BUTton>
</div>
<div class="lowbtn">
<div class="btnline1">
<button onclick="appendChar('7')">7</button>
<button onclick="appendChar('8')">8</button>
<button onclick="appendChar('9')">9</button>
<button onclick="appendChar('-')">-</button>
</div>
<div class="btnline2">
<button onclick="appendChar('4')">4</button>
<button onclick="appendChar('5')">5</button>
<button onclick="appendChar('6')">6</button>
<button onclick="appendChar('+')">+</button>
</div>
<div class="btnline3">
<button onclick="appendChar('1')">1</button>
<button onclick="appendChar('2')">2</button>
<button onclick="appendChar('3')">3</button>
<button onclick="appendChar('/')">/</button>
</div>
<div class="btnline4">
<button onclick="appendChar('0')">0</button>
<button onclick="appendChar('.')">.</button>
<button onclick="appendChar('*')">*</button>
<button onclick="getAnswer()">=</button>
</div>
</div>
</div>
</body>
<script>
function appendChar(character) {
document.getElementById("display").value += character
}
function getAnswer(){
document.getElementById("display").value = eval(document.getElementById("display").value);
}
function clearDisplay(){
document.getElementById("display").value ="";
}
function removeOne(){
document.getElementById("display").value = document.getElementById("display").value.slice(0,-1) ;
}
</script>
</html>