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evt_calculator.html
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evt_calculator.html
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<html>
<head>
<script>
let expression="";
function add(character) {
expression = expression + character;
document.getElementById("display").value = expression;
}
function compute() {
document.getElementById("display").value = eval(expression);
expression=eval(expression);
}
function clearDisplay() {
expression = "";
document.getElementById("display").value = 0;
}
</script>
</head>
<body>
<form>
display <input id="display" value="0" size="30">
<br>
<input type="button" value=" 7 " onclick="add('7')">
<input type="button" value=" 8 " onclick="add('8')">
<input type="button" value=" 9 " onclick="add('9')">
<input type="button" value=" / " onclick="add('/')">
<br>
<input type="button" value=" 4 " onclick="add('4')">
<input type="button" value=" 5 " onclick="add('5')">
<input type="button" value=" 6 " onclick="add('6')">
<input type="button" value=" * " onclick="add('*')">
<br>
<input type="button" value=" 1 " onclick="add('1')">
<input type="button" value=" 2 " onclick="add('2')">
<input type="button" value=" 3 " onclick="add('3')">
<input type="button" value=" - " onclick="add('-')">
<br>
<input type="button" value=" 0 " onclick="add('0')">
<input type="button" value=" + " onclick="add('+')">
<br>
<input type="button" value=" Clear " onclick="clearDisplay()">
<input type="button" value=" Enter " name="enter" onclick="compute()">
</form>
</body>
</html>