Author Topic: pow function not working properly  (Read 2215 times)

Offline gbogya

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pow function not working properly
« on: March 02, 2016, 08:07:06 am »
Hi guys!
I discovered recently that the pow function isn't working as it should. For example: pow(10,2) is 99, whereas it should be 100. Pow(100,1) is also 99. I could go on and on giving examples, but I think you understand my point. Could you fix it please? I'm using version 13.12

Offline raynebc

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Re: pow function not working properly
« Reply #1 on: March 02, 2016, 08:34:11 am »
1.  This isn't a Codeblocks problem.
2.  pow() returns a floating point value, so you're probably seeing a rounding error converting it to integer.  Find or build a replacement function that uses integer math, or just simply round the result up to the nearest integer like this:
Code: [Select]
int x = pow(10,2) + 0.5;

Offline gbogya

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Re: pow function not working properly
« Reply #2 on: March 02, 2016, 08:42:56 am »
Thanks m8!

Offline studentShiro

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Re: pow function not working properly
« Reply #3 on: July 29, 2020, 11:55:26 am »
Can some one explain further about this?

But when I try using Visual C++, it works as it should.
Why can't Code::Blocks?

Offline Miguel Gimenez

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Re: pow function not working properly
« Reply #4 on: July 29, 2020, 01:24:08 pm »
Code::Blocks is not a compiler, it knows nothing about pow(). You should ask this in a forum related to your compiler or read about floating point errors.