Question

129

rated 0 times [ 136] [ 7] / answers: 1 / hits: 31680 / 13 Years ago, tue, may 17, 2011, 12:00:00

I was wondering how can I subtract two negative Floating-Point numbers in javascript. I tried:

alert(-0.2-0.1);

and the result is -0.30000000000000004. Am I doing something wrong? What do I have to do to get -0.3 ?

Only authorized users can answer the question. Please sign in first, or register a free account.

Total Points: 720

Total Questions: 85

Total Answers: 90

Location: Central African Republic

Member since Fri, Jun 5, 2020

4 Years ago

answered 13 Years ago yulissamirandah · Accepted Answer

No, nothing wrong with your code, most decimal fractions cannot be represented exactly
in binary, use

number.toFixed(x)

Where x is the number of decimals you want and number is the result of the subtraction.