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## Main Question or Discussion Point

How would I go about defining pi (and using) as 3.1415926535897932384626433832795?

I've tried using double, long double and #define pi 3.1415926535897932384626433832795 but it, instead, takes 3.14159.

Is there any way to get it more accurate?

I've tried using double, long double and #define pi 3.1415926535897932384626433832795 but it, instead, takes 3.14159.

Is there any way to get it more accurate?