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Why this calculation is like this

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Nov 09.2006

I have Intel P4 1.6 MHz, win XP professional 2002 SP2, apache 2.2.3, php 5 and five major browsers. the following simple javascript code
——————————————

<script type=”text/javascript”>
document.write(8.8+0.8)

</script>
—————————————-


gives output
———————————–


9.600000000000001
——————————

Why? It works fine with PHP. Why should one use data conversion and all other things for this simple calculation.

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JavaScript

3 Comments(s) ↴

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@gil_davisNov 09.2006 — I'm afraid you'll just have to live with it.Javascript numbers are represented in binary as IEEE-754 Doubles, with a resolution of 53 bits, giving an accuracy of 15-16 decimal digits; integers up to about 9e15 are precise, but few decimal fractions are. Given this, arithmetic is as exact as possible, but no more. Operations on integers are exact if the true result and all intermediates are integers within that range.[/quote]So if you did(88 + 8) / 10 you will get 9.6. ?
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@CharlesNov 09.2006 — Put more shortly, unlike calculators computers are bad at math.
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@mandar_shikharauthorNov 09.2006 — thanks for the response

Actually I was designing a web calculator

http://www.familyvillage.org.np/xml/calc.html

I'm not sure if i convert the numbers to integers or other limited precision types to limit the calculation capacity of the calculator.
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