A simple math calculator that I wrote using JavaScript programming language.
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My mobile number here in the Philippines is 09173084360.
Program Listing
index.htm
<html>
<style>
body {
background-color:lightgreen;
font-family:arial;
font-size:20px;
font-weight:bold;
color:blue;
}
p {
font-family:arial;
font-size:20px;
font-weight:bold;
color: blue;
}
div.text {
margin: 0;
padding: 0;
padding-bottom: 1.25em;
}
div.text label {
margin: 0;
padding: 0;
display: block;
font-size: 100%;
padding-top: .1em;
padding-right: 2em;
width: 8em;
text-align: right;
float: left;
}
div.text input,
div.text textarea {
margin: 0;
padding: 0;
display: block;
font-size: 100%;
}
input:active,
input:focus,
input:hover,
textarea:active,
textarea:focus,
textarea:hover {
background-color: lightyellow;
border-color: yellow;
}
</style>
<body><br>
<h2 align="left"> Simple Math Calculator in JavaScript </h2>
<br>
<div class="text">
<label for="val1">Item Value No. 1</label>
<input type="text" size="5" name="val1" id="val1" maxlength="5"/>
</div>
<div class="text">
<label for="val2">Item Value No. 2</label>
<input type="text" size="5" name="val2" id="val2" maxlength="5"/>
</div>
<button onclick="compute()" title="Click here to find the result."> Ok </button>
<button onclick="clear_all()" title="Click here to clear the text fields."> Clear </button>
<br><br><br>
<p id="display1"> </p>
<p id="display2"> </p>
<p id="display3"> </p>
<p id="display4"> </p>
<script>
function compute()
{
var val1 = document.getElementById('val1').value;
var val2 = document.getElementById('val2').value;
var sum = parseInt(val1) + parseInt(val2);
var subtract = parseInt(val1) - parseInt(val2);
var product = parseInt(val1) * parseInt(val2);
var quotient = parseInt(val1) / parseInt(val2);
document.getElementById("display1").innerHTML = "The sum of " + val1 + " and " + val2 + " is " + sum + ".";
document.getElementById("display2").innerHTML = "The difference between " + val1 + " and " + val2 + " is " + subtract + ".";
document.getElementById("display3").innerHTML = "The product between " + val1 + " and " + val2 + " is " + product + ".";
document.getElementById("display4").innerHTML = "The quotient between " + val1 + " and " + val2 + " is " + quotient + ".";
}
function clear_all()
{
document.getElementById("display1").innerHTML ="";
document.getElementById("display2").innerHTML ="";
document.getElementById("display3").innerHTML ="";
document.getElementById("display4").innerHTML ="";
document.getElementById("val1").value="";
document.getElementById("val2").value="";
document.getElementById("val1").focus();
}
</script>
</body>
<html>
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