Floating point arithmetic in Javascript

Question

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Is JavaScript's Math broken?

I have just started playing around with Javascript in the last couple of days and I have noticed something that appears to be quite peculiar. When I add some numbers together, I end up with a marginally incorrect answer.

4.99 + 0.98 = 5.970000000000001

Why does this happen?

score 7 · Accepted Answer · answered Feb 22 '12 at 12:14

7

I invite you to read "What Every Computer Scientist Should Know About Floating-Point Arithmetic".

answered Feb 22 '12 at 12:14

Darin Dimitrov

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It's a lot to know... it should be called "What A Computer Scientist **Could** Know About Floating-Point Arithmetic" – gdoron Feb 22 '12 at 12:16

score 0 · Answer 2 · answered Feb 22 '12 at 12:19

0

You can use sprintf like this:

console.log(sprintf("%.2f", (4.99 + 0.98))); // 5.97

answered Feb 22 '12 at 12:19

Sarfraz

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Floating point arithmetic in Javascript

2 Answers2