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<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='utf-8' />
<meta name="Author" content="M Mclaughlin">
<title>Testing Big against Number</title>
<style>
body,ul,form,h1,div{margin:0;padding:0;}
body{font-family:Calibri, Arial, Sans-Serif;}
form{width:48em;border:2px solid #c8c8c8;margin:1.6em auto;}
h1{text-align:center;font-size:1.2em;background-color:#c8c8c8;padding:.6em 0;}
ul{list-style-type:none;color:#555;padding:1em 1em 0 2em;}
.input,ul{background-color:#f5f5f5;}
.input,.output{padding:0 1em 1em 2em;}
.output,.methods{background-color:#e1e1e1;}
.methods{padding-bottom:1em;}
.output{padding-bottom:2em;}
.size{width:80%;}
label{width:10em;color:#000;margin-left:.6em;display:inline-block;}
span{font-size:.9em;}
.arg,.result,.dp{width:5em;margin-right:.8em;margin-top:1.2em;}
.dp{width:auto;}
.code{width:60em;font-family:Courier New, Courier, monospace;font-size:.8em;margin:0 auto;}
</style>
<script src='../../big.js'></script>
</head>
<body>
<form>
<h1>Testing Big against Number</h1>
<ul class='methods'>
<li>
<input type='radio' id='toExponential' name=1/>
<label for='toExponential'>toExponential</label>
<span>[ decimal places ]</span>
</li>
<li>
<input type='radio' id='toFixed' name=1/>
<label for='toFixed'>toFixed</label>
<span>[ decimal places ]</span>
</li>
<li>
<input type='radio' id='toPrecision' name=1/>
<label for='toPrecision'>toPrecision</label>
<span>[ significant digits ]</span>
</li>
<li>
<input type='radio' id='round' name=1/>
<label for='round'>round</label>
<span>[ decimal places [ , rounding mode ] ]</span>
</li>
<li>
<input type='radio' id='sqrt' name=1/>
<label for='sqrt'>sqrt</label>
</li>
</ul>
<ul id='roundings'>
<li>
<input type='radio' id=0 name=2/>
<label for=0 >Round down</label>
<span>Round towards zero. I.e. truncate, no rounding</span>
</li>
<li>
<input type='radio' id=1 name=2/>
<label for=1 >Round half up</label>
<span>Round towards nearest neighbour. If equidistant, round up</span>
</li>
<li>
<input type='radio' id=2 name=2/>
<label for=2 >Round half even</label>
<span>Round towards nearest neighbour. If equidistant, round towards even neighbour</span>
</li>
<li>
<input type='radio' id=3 name=2/>
<label for=3 >Round up</label>
<span>Round away from zero.</span>
</li>
</ul>
<div class='input'>
<div class='dpDiv'>
<label class='dp' id='dpLabel' for='dp'>Decimal places:</label>
<input type='text' id='dp' name='dp' size=20 />
</div>
<label class='arg' for='input'>Input:</label>
<input class='size' type='text' id='input' name='input' />
</div>
<div class='output'>
<label class='result' for='big'>Big:</label>
<input class='size' type='text' id='big' name='big' readonly />
<div id='number'>
<label class='result' for='num'>Number:</label>
<input class='size' type='text' id='num' name='num' readonly />
</div>
</div>
</form>
<div class= 'code' id='code'></div>
<script>
(function () {
var i, lastFocus,
d = document,
$ = function (id) {return d.getElementById(id)},
$input = $('input'),
$dp = $('dp'),
$dpLabel = $('dpLabel'),
$num = $('num'),
$big = $('big'),
$number = $('number'),
$roundings = $('roundings'),
$code = $('code'),
$inputs = d.getElementsByTagName('input');
function round() {
var i, rb, method, mode, includeNumber, numVal,
bigVal, isSqrt, oldDP, noDP,
code = '',
dp = ( $dp.value = $dp.value.replace(/\s+/g, '') ),
input = ($input.value = $input.value.replace(/\s+/g, ''));
if ( noDP = !/(^0$|^[1-9]\d*$)/.test(dp) ) {
dp = ( $dp.value = '' );
}
if (input) {
for (i = 0; i < 9; i++) {
rb = $inputs[i];
if (rb.checked) {
if (i < 5) method = rb.id;
else mode = rb.id;
}
}
$num.value = $big.value = $code.innerHTML = '';
isSqrt = method == 'sqrt';
if (includeNumber = method != 'round') {
try {
numVal = isSqrt
? Math.sqrt(input)
: Number(input)[method]( noDP ? undefined : +dp );
} catch(e) {
numVal = e;
}
if (isSqrt) {
if (!noDP) {
oldDP = Big.DP;
try {
Big.DP = +dp;
} catch(e) {
Big.DP = oldDP;
$big.value = e;
return;
}
}
code = 'Big.DP = ' + Big.DP;
}
Big.RM = +mode;
if (code) code += '<br>';
code += 'Big.RM = ' + mode;
}
code += "<br><br>Big('" + input + "')." + method + "(";
if (!isSqrt) {
if (method == 'round') {
if (noDP) {
noDP = dp = null;
}
code += dp + ", " + mode;
} else code += dp;
}
code += ')<br><br>';
if (includeNumber) {
if (isSqrt) {
code += "Math.sqrt('" + input + "')";
} else {
code += "Number('" + input + "')." + method + "(";
if (!noDP) code += dp;
code += ")";
}
}
try {
bigVal = new Big(input)[method]( noDP ? undefined : +dp, +mode);
} catch(e) {
bigVal = e;
}
setTimeout(function () {
$big.value = bigVal;
if (includeNumber) $num.value = numVal;
$code.innerHTML = code;
}, 100);
if (window.console && console.log) {
input = new Big(input);
console.log('\nc: ' + input.c +
'\ne: ' + input.e +
'\ns: ' + input.s);
}
}
lastFocus.focus();
}
oldDP = Big.DP = 20;
Big.RM = 1;
$input.value = $dp.value = $num.value = $big.value = '';
setTimeout(function () {$input.focus()}, 0);
for (i = 0; i < 9; i++) {
$inputs[i].checked = false;
$inputs[i].onclick = function () {
if (this.id >= 0) {
round();
} else {
$dpLabel.innerHTML = this.id == 'toPrecision'
? 'Significant digits:'
: 'Decimal places:';
$number.style.display = this.id == 'round'
? 'none'
: 'block';
$roundings.style.display = 'block';
$dp.value = $big.value = $num.value = $code.innerHTML = '';
lastFocus.focus();
}
};
}
$input.onfocus = $dp.onfocus = function () {
lastFocus = this;
};
$inputs[0].checked = $inputs[6].checked = true;
document.onkeypress = function (e) {
if ((e || window.event).keyCode == 13) {
round();
return false;
} else $num.value = $big.value = '';
};
})();
</script>
</body>
</html>
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