How to find value of pi(22/7) actual value

Answer 1

in any language there is a Math Library. use the Pi variable.

Answer 2

just so you know, pi isn't equal to 22/7, it's just an approximation.
pi is an irrational number which is the ratio of the circumference and the diameter of a circle.
here's a link to pi calculated upto a million decimal places.
http://www.piday.org/million/