Created
October 17, 2017 19:54
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Simple basic Calculator using javaScript. Functions addition, subtraction, multiplication and division with maintaining history of previous answer.
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<!-- Basic calculator using javaScript --> | |
<html> | |
<head> | |
<title>Calculator</title> | |
<style type="text/css"> | |
.field{ | |
padding: 4px; | |
border-radius: 4px; | |
border: solid black 1px; | |
margin: 3px; | |
font-size: 25px; | |
width: 30%; | |
} | |
.btn { | |
padding: 10px 18px 10px 18px; | |
font-size: 20px; | |
margin-bottom: 2px; | |
color: darkblue; | |
background: gainsboro; | |
border-radius: 6px; | |
width: 32%; | |
} | |
.content{ | |
width: 50%; | |
float: left; | |
} | |
.history{ | |
width: 48%; | |
float: left; | |
padding: 10px; | |
background: lightgray; | |
} | |
.main{ | |
padding: 30px 100px 100px 100px; | |
} | |
</style> | |
<script type="text/javascript"> | |
s=true; | |
function insert (n) { | |
document.getElementById("result").innerHTML = ""; | |
if (s) { | |
document.getElementById("one").value+=n; | |
}else{ | |
document.getElementById("two").value+=n; | |
} | |
} | |
function togl () { | |
s=!s; | |
} | |
function clr () { | |
s = true; | |
document.getElementById("one").value=""; | |
document.getElementById("two").value=""; | |
document.getElementById("result").innerHTML=""; | |
document.getElementById("history").innerHTML=""; | |
} | |
function operation (op) { | |
var result; | |
var in1 = document.getElementById("one").value; | |
var in2 = document.getElementById("two").value; | |
if ((in1 != '') && (in2 != '') ) { | |
if (op == "+") { | |
result = parseInt(in1) + parseInt(in2); | |
}else if (op == "-") { | |
result = in1 - in2; | |
}else if (op == "/") { | |
result = in1 / in2; | |
}else if (op == "*") { | |
result = in1 * in2; | |
} | |
document.getElementById("result").innerHTML = "Result: " + result; | |
document.getElementById("history").innerHTML += "<span onclick='insert(this.innerHTML)'>" + in1 + "</span> " + op + " <span onclick='insert(this.innerHTML)'>" + in2 + "</span> = <span onclick='insert(this.innerHTML)'>" + result + "</span><br>"; | |
document.getElementById("one").value = ""; | |
document.getElementById("two").value = ""; | |
togl(); | |
}else{ | |
document.getElementById("result").innerHTML = "Please enter value 1 and value 2."; | |
} | |
} | |
function back () { | |
in1 = document.getElementById("one").value; | |
in2 = document.getElementById("two").value; | |
in1 = in1/10; | |
in2 = in2/10; | |
if (parseInt(in1) != 0 && s) { | |
document.getElementById("one").value = parseInt(in1); | |
}else if (parseInt(in1) == 0 && s){ | |
document.getElementById("one").value = ""; | |
}else if (parseInt(in2) != 0 && s == false) { | |
document.getElementById("two").value = parseInt(in2); | |
}else{ | |
document.getElementById("two").value = ""; | |
} | |
} | |
function change () { | |
in1 = document.getElementById("one").value; | |
in2 = document.getElementById("two").value; | |
in1 = -in1; | |
in2 = -in2; | |
if (parseInt(in1) != 0 && s) { | |
document.getElementById("one").value = parseInt(in1); | |
}else if (parseInt(in2) != 0 && s == false) { | |
document.getElementById("two").value = parseInt(in2); | |
} | |
} | |
</script> | |
</head> | |
<body style="background: gray;"> | |
<h1 style="text-align:center;padding-top: 50px;">Calculator</h1> | |
<div class="main"> | |
<div class="content"> | |
<div style="margin-bottom:5px;"> | |
<div> | |
<span><strong>Value 1:</strong></span> | |
<input type="text" value="" id="one" class="field"> | |
</div> | |
<div> | |
<span><strong>Value 2:</strong></span> | |
<input type="text" value="" id="two" class="field" onclick="togl()"> | |
</div> | |
<div> | |
<h4><strong><span id="result"></span></strong></h4> | |
</div> | |
</div> | |
<div style="width: 40%;"> | |
<button onclick="insert(1)" class="btn">1</button> | |
<button onclick="insert(2)" class="btn">2</button> | |
<button onclick="insert(3)" class="btn">3</button> | |
<button onclick="insert(4)" class="btn">4</button> | |
<button onclick="insert(5)" class="btn">5</button> | |
<button onclick="insert(6)" class="btn">6</button> | |
<button onclick="insert(7)" class="btn">7</button> | |
<button onclick="insert(8)" class="btn">8</button> | |
<button onclick="insert(9)" class="btn">9</button> | |
<button onclick="insert(0)" class="btn">0</button> | |
<button onclick="operation('+')" class="btn">+</button> | |
<button onclick="operation('-')" class="btn">-</button> | |
<button onclick="operation('/')" class="btn">/</button> | |
<button onclick="operation('*')" class="btn">*</button> | |
<button onclick="togl()" class="btn">S</button> | |
<button onclick="clr()" class="btn">C</button> | |
<button onclick="back()" class="btn"><--</button> | |
<button onclick="change()" class="btn">+/-</button> | |
</div> | |
</div> | |
<div class="history"> | |
<div> | |
<p>History</p> | |
<div id="history"></div> | |
</div> | |
</div> | |
</div> | |
</body> | |
</html> |
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