#include <stdio.h>

main() {
   int val ; 

   printf( "Enter 1. Add, 2. Sub, 3. Mul, 4. Div: ") ; 
   scanf( "%d", &val) ; 

   switch( val) { 
   case 1:
      printf( "Add!\n") ; 
      break ; 
   case 2:
      printf( "Sub!\n") ; 
      break ; 
   case 3:
      printf( "Mul\n") ; 
      break ; 
   case 4:
      printf( "Div\n") ; 
      break ; 
   default:
      printf( "Bad choice\n") ; 
      break ; 
   }

   printf( "Done.\n") ; 
}