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index.html
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<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script>
function insert(num){
document.form.textView.value += num;
}
function resultado(){
var texto = document.form.textView.value;
if (texto) {
document.form.textView.value = eval(texto);
}
}
function limpar(){
document.form.textView.value = "";
}
function voltar(){
var texto = document.form.textView.value;
document.form.textView.value = texto.substring(0, texto.length-1);
}
</script>
<style>
*{
margin: 0px;
padding: 0px;
}
.main{
position: absolute;
top: 50%;
left: 50%;
background: rgb(92, 112, 141);
transform: translateX(-50%) translateY(-50%);
}
.button{
width: 50px;
height: 50px;
font-size: 25px;
margin: 2px;
cursor: pointer;
}
.buttonH{
width: 110px;
height: 50px;
font-size: 25px;
margin: 2px;
cursor: pointer;
}
.buttonV{
width: 50px;
height: 110px;
font-size: 25px;
margin: 2px;
cursor: pointer;
}
.textView{
width: 208px;
margin: 5px;
font-size: 25px;
padding: 5px;
border: 1px solid black;
}
</style>
<title>Calculadora</title>
</head>
<body>
<div class="main">
<form name="form">
<input class="textView" name="textView">
</form>
<table>
<tr>
<td><input class="button" type="button" value="C" onclick="limpar()"></td>
<td><input class="button" type="button" value="<" onclick="voltar()"></td>
<td><input class="button" type="button" value="/" onclick="insert('/')"></td>
<td><input class="button" type="button" value="X" onclick="insert('*')"></td>
</tr>
<tr>
<td><input class="button" type="button" value="7" onclick="insert(7)"></td>
<td><input class="button" type="button" value="8" onclick="insert(8)"></td>
<td><input class="button" type="button" value="9" onclick="insert(9)"></td>
<td><input class="button" type="button" value="-" onclick="insert('-')"></td>
</tr>
<tr>
<td><input class="button" type="button" value="4" onclick="insert(4)"></td>
<td><input class="button" type="button" value="5" onclick="insert(5)"></td>
<td><input class="button" type="button" value="6" onclick="insert(6)"></td>
<td><input class="button" type="button" value="+" onclick="insert('+')"></td>
</tr>
<tr>
<td><input class="button" type="button" value="1" onclick="insert(1)"></td>
<td><input class="button" type="button" value="2" onclick="insert(2)"></td>
<td><input class="button" type="button" value="3" onclick="insert(3)"></td>
<td rowspan="2"><input class="buttonV" type="button" value="=" onclick=resultado()></td>
</tr>
<tr>
<td colspan="2"><input class="buttonH" type="button" value="0" onclick="insert(0)"></td>
<td><input class="button" type="button" value="." onclick="insert('.')"></td>
</tr>
</table>
</div>
</body>
</html>