Question

91

Simple subtraction bug in Javascript

rated 0 times [ 95] [ 4] / answers: 1 / hits: 18845 / 14 Years ago, tue, march 1, 2011, 12:00:00

I was shocked to see such a basic subtraction bug in JS, I am sure most of you here would have experienced this issue, please help me with a work around here,
All I am doing is subtracting a number from 100 which gives unexpected results, an example is stated below

100 - 99.1

// returns 0.9000000000000057

Am I doing something wrong here ? :S I am confused

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tyemathewj

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answered 14 Years ago ezequiel · Accepted Answer

Floating point values are never accurate as you expect. You can use Number object to convert this to answer as you need.

Number(100).toFixed(2) - Number(99.1).toFixed(2)