Answer 1

here you go
you can read and write file using http://www.cplusplus.com/reference/cstdio/
and here the math part http://www.cplusplus.com/reference/cmath/
you'll also probably need this http://www.cplusplus.com/reference/cstdlib/

Answer 2

That is just right Taste.
Alok Behera please at least try to solve your homework and then if you don't understand something you can ask questions.