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calculator.js
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calculator.js
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function evaluate(op, op1, op2) {
op1 = parseFloat(op1);
op2 = parseFloat(op2);
var result = NaN;
if (op === "+")
result = op1 + op2;
if (op === "\u2212") //minus
result = op1 - op2;
if (op === "\u00d7") //times
result = op1 * op2;
if (op === "\u00f7") {//divide
if (op2 !== 0)
result = op1 / op2;
}
if (isNaN(result))
return "Not a number";
return result.toString();
}
$(document).ready(function() {
var is_typing = false;
var has_dot = false;
var is_cleared = true;
var op1_str = "";
$(".btn-number").click(function() {
is_cleared = false;
var digit = $(this).text();
var output = $("#output").text();
if (!is_typing) {
if (digit !== "0" || output !== "0") {
output = digit;
is_typing = true;
}
} else {
if (output.length < 17)
output = output + digit;
}
$("#output").text(output);
});
$("#btn-clear").click(function() {
is_cleared = true;
is_typing = false;
has_dot = false;
$("#output").text("0");
$("#operator").text("");
op1_str = "";
});
$("#btn-dot").click(function() {
if (!has_dot && (is_typing || is_cleared)) {
has_dot = true;
is_typing = true;
$("#output").text($("#output").text() + ".");
}
is_cleared = false;
});
$("#btn-negate").click(function() {
if (is_cleared) return;
var output_str = $("#output").text().trim();
if (output_str[0] === "-")
output_str = output_str.replace("-", "");
else if (output_str !== '0')
output_str = "-" + output_str;
$("#output").text(output_str);
});
$(".btn-operator").click(function () {
if (op1_str !== "" && is_typing) {
var result = evaluate($("#operator").text(), op1_str, $("#output").text());
$("#output").text(result);
op1_str = "";
}
op1_str = $("#output").text();
$("#operator").text($(this).text());
is_typing = false;
has_dot = false;
is_cleared = false;
})
$("#btn-eq").click(function() {
is_typing = false;
has_dot = false;
is_cleared = false;
var op = $("#operator").text();
if (op1_str !== "") {
var result = evaluate(op, op1_str, $("#output").text())
op1_str = "";
$("#operator").text("");
$("#output").text(result);
}
op1_str = "";
});
});