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Re: Problem with Float type variable

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Re: Problem with Float type variable

Subject: Re: Problem with Float type variable
From: Graham Cox <email@hidden>
Date: Sat, 15 Aug 2009 16:53:10 +1000


On 15/08/2009, at 4:46 PM, Adil Saleem wrote:

On calling this, the variable aFloat in setMyvar method gets value 863.599976. I also tried giving it 6.600000 but still didn't work correctly. I don't understand why is it changing the value. Why doesn't it get 863.6 ?

This is a classic misunderstanding of floats. Look up "floating point precision". Basically, a float is 32 bits - it can only represent 2^32 different values, not the infinity of numbers that exist. So quite often certain values are rounded off, truncated or represent by something "close". If you need exact values, use integers.

--Graham


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