Printing a big integer in JavaScript?

Question

I am experimenting with a JavaScript library for working with big integers called BigInteger.js.

Specifically, I am trying to print a big integer. However, I am getting puzzling results. For instance, when I try this:

var x= bigInt("53542885039854749852");
document.write(x+"<br>");

...I am getting 53542885039854750000. And when I try this:

var x= bigInt("104156103156113102156118165104101120101");
document.write(x+"<br>");

...the result is 1.041561031561131e+38.

Can someone help me understand why I am not getting the results I expect?

Nina Scholz · Accepted Answer · 2016-06-18 16:25:26Z

You could use the toString() method to get a string with all digits.

Note that arithmetical operators will trigger the valueOf function rather than the toString function. When converting a bigInteger to a string, you should use the toString method or the String function instead of adding the empty string.

bigInt("999999999999999999").toString() => "999999999999999999"

String(bigInt("999999999999999999")) => "999999999999999999"

bigInt("999999999999999999") + "" => 1000000000000000000

var x= bigInt("53542885039854749852");
document.write(x + "<br>");             // this calls valueOf
document.write(x.valueOf() + "<br>");
document.write(x.toString() + "<br>");

<script src="http://peterolson.github.com/BigInteger.js/BigInteger.min.js"></script>

To calculate something, you could use the methods of the class.

   
var y = bigInt("104156103156113102156118165104101120101");
document.write(y.plus(1).toString() + "<br>");
document.write(y.multiply(2).toString() + "<br>");
document.write(y.plus(y).toString() + "<br>");

<script src="http://peterolson.github.com/BigInteger.js/BigInteger.min.js"></script>

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