Spoken Tutorials - Bash Assignment 
				Funded by the National Mission on Education through ICT
				       Indian Institute of Technology Bombay,
					       http://spoken-tutorial.org
-------------------------------------------------------------------------------------------------------------------
Case statement

1) Write a menu driven program for mathematical calculation
   a. It should take user inputs a and b
   b. It should ask for mathematical operator (+, -, / and *).
   c. Do the calculation
   d. Print the output