Code::Blocks Forums

User forums => Using Code::Blocks => Topic started by: gbogya on March 02, 2016, 08:07:06 am

Title: pow function not working properly
Post by: gbogya 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

Title: Re: pow function not working properly
Post by: raynebc 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

int x = pow(10,2) + 0.5;

Title: Re: pow function not working properly
Post by: gbogya on March 02, 2016, 08:42:56 am

Thanks m8!

Title: Re: pow function not working properly
Post by: studentShiro 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?

Title: Re: pow function not working properly
Post by: Miguel Gimenez 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.