Write a program to perform the following operations on stack data structure.

c.1 Create push and pop functions and display the items [12,9,3,25,19,0,5,30,9] after performing push and then pop operation.

c.2 Write a function to convert an infix expression (2 (1 / 5 ) * 6 + 12 ) * 33 % 9) to postfix expression and display the result.

c.3 Applying best practices for writing code comments