Changes

*<math> PI()</math> is denoted by the Greek letter <math> \pi</math>.  

*<math> PI()</math> is denoted by the Greek letter <math> \pi</math>.  

*<math> \pi </math> is a transcendental number and irrational number.  

*<math> \pi </math> is a transcendental number and irrational number.  

*Being an irrational number,<math> π </math> cannot be expressed exactly as a ratio of any two integers ,but we can express as the fraction 22/7 is approximate to the  π value , also no fraction can be its exact value.  

*Being an irrational number, <math> \pi </math> cannot be expressed exactly as a ratio of any two integers, but we can express as the fraction 22/7 is approximate to the  <math> \pi </math> value, also no fraction can be its exact value.  

       This function will give the result as error when n<0.

       This function will give the result as error when <math>n<0</math>.

==Examples==

==Examples==