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calculadoracomhtml.html
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<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>exercicios</title>
</head>
<body>
<div>
<input id="a" type="number" placeholder="digite um numero">
<input id="b" type="number" placeholder="digite um numero">
<br><br>
<button id="soma" type="button" name="somar" onclick="somar()"> somar</button>
<br><br>
<button id="soma" type="button" name="somar" onclick="multiplicar()"> multiplicar</button>
<br><br>
<button id="soma" type="button" name="somar" onclick="dividir()"> dividir</button>
<br><br>
<button id="soma" type="button" name="somar" onclick="subtrair()"> subtrair</button>
<br><br>
</div>
<div id="resp">resultado : </div>
</body>
</html>
<script>
function somar() {
var resp = document.getElementById("resp")
var num1 = document.getElementById('a')
var num2 = document.getElementById('b')
var input1 = Number(num1.value)
var input2 = Number(num2.value)
resp = input1 + input2;
document.getElementById('resp').innerText = resp
}
function multiplicar() {
var resp = document.getElementById("resp")
var num1 = document.getElementById('a')
var num2 = document.getElementById('b')
var input1 = Number(num1.value)
var input2 = Number(num2.value)
resp = input1 * input2;
document.getElementById('resp').innerText = resp
}
function dividir() {
var resp = document.getElementById("resp")
var num1 = document.getElementById('a')
var num2 = document.getElementById('b')
var input1 = Number(num1.value)
var input2 = Number(num2.value)
resp = input1 / input2;
document.getElementById('resp').innerText = resp
}
function subtrair() {
var resp = document.getElementById("resp")
var num1 = document.getElementById('a')
var num2 = document.getElementById('b')
var input1 = Number(num1.value)
var input2 = Number(num2.value)
resp = input1 - input2;
document.getElementById('resp').innerText = resp
}
</script>