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?

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?

• javascript
• string
• printing
• integer
• biginteger

Share Improve this question Follow edited Dec 29, 2018 at 21:22 DavidRR 19.5k2727 gold badges111111 silver badges197197 bronze badges asked Jun 18, 2016 at 14:53 JORdJORd 10911 silver badge1010 bronze badges 0

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1 Answer 1

Sorted by: Reset to default 7

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./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./BigInteger.js/BigInteger.min.js"></script>