Declare 4 variables as int.
Have the different operations like addition,subtraction etc. represented by different numbers.Display the information regarding it.
Accept a no. as input from the user for 'choice' and store it in 1 variable.
Accept 2 nos. as input from the user for 'I no.' & 'II no.' and store it in 2 variables.
Use the 'choice' variable in switch.
For different cases,perform different operations on the 2 nos. and store it in another variable as 'answer'.
Finally,display the 'answer' by using the variable.
Math.h is not required for simple arithmetic operations like +,- etc.