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Calculator using Javascript #10

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Calculator using Javascript #10

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73 changes: 73 additions & 0 deletions JS-calculator.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
<style type="text/css" rel="stylesheet">
body{
background-color: antiquewhite;
}
div{
padding: 20px;
}
</style>
</head>
<body>
<div id="first">Enter the first Number <input type=number id="firstNumber" placeholder="first number"></div>
<div id="second">Enter the second Number <input type=number id="secondNumber" placeholder="second number"></div>
<form>
<select id="operation">
<option disabled selected value="0">-- Choose an Operation --</option>
<option value="1">Addition</option>
<option value="2">Subtraction</option>
<option value="3">Multiplication</option>
<option value="4">Divison</option>
</select>
</form>
<div id="button">
<button type="button" id="calculate">Calculate!</button>
</div>
<div id="answer">
<input id="ans" placeholder="Answer">
</div>

<script>
function calculate() {
var firstNum=document.getElementById("firstNumber").value;
var secondNum=document.getElementById("secondNumber").value;
var operation=document.getElementById("operation").value;

if (firstNum === "" || secondNum === "" || operation == 0){
alert("Please Enter all the values");
return;
}



if (operation == 1){
var total= (Number(firstNum) + Number(secondNum));
}
else if(operation == 2){
var total= (firstNum - secondNum);
}
else if(operation == 3){
var total= (firstNum * secondNum);
}
else{
if(secondNum == 0){alert("Divison by Zero is not possible.");}
else{var total= (firstNum/secondNum);}

}
document.getElementById("answer").style.display = "block";
document.getElementById("ans").value = total;
}

document.getElementById("calculate").onclick = function() {
calculate(); }
</script>
</body>
</html>