mattnewbie - 1 year ago 248

Javascript Question

For example:

`sumStrings('1','2') // => '3'`

C# sumStrings("1","2") // => "3"

My code:

`function sumStrings(a,b) {`

a = Number(a);

b = Number(b);

var total = a + b ;

return total.toString();

}

When I try the above code with the following, it has a problem.

`sumStrings('712569312664357328695151392', '8100824045303269669937');`

I get :

`7.125774134884027e+26`

Instead of:

`712577413488402631964821329`

Help please!

Answer Source

Your result is being returned to you in floating point because it is greater than the maximum integer value.

The max int value in javascript I believe is 9007199254740991.

You can check the limits by viewing: `alert([ Number.MAX_VALUE, Number.MIN_VALUE ]);`

Edit: If you need big integer math without loss of precision, you need a biginteger library similar to this: https://github.com/peterolson/BigInteger.js