PI is #defined in <math.h>, right?

Is PI is #defined in <math.h>? Becuase it isn't with my compiler (Dev-c++ 4.0).

Although it is with DJGPP.

No, you are looking for M_PI

Actually, I can't find anywhere in the standard that defines it, so you might have M_PI, but I wouldn't rely on it. #define your own? pi isn't likely to change in the near future. :p

Quote:

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Originally Posted by cwr

pi isn't likely to change in the near future. :p

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:eek: lol

PI IS EXACTLY THREE!

Code:

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#define PI 3

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(My attempt at starting a flame war)

M_PI (like PI) is actually non-standard. But it is a somewhat common extension to math.h

Code:

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#define PI 3.141592653589793238462643383...

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:p

Yeah, I know how to get PI - just open a calculator and click on pi. But I thought PI was defined in <math.h>. I guess I'll just declare it myself.

Code:

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const double pi = 4. * atan(1.);

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:D