switch(i){  
   case 16.0:  INFO[top-1] = INFO[top]  
               top--  
   case 17.0:  temp = newtemp()  
               NEWQUAD(4, SYMTBL[temp,3], - loc_of_1_in_int_tbl, 0)  
               top++  
               INFO[top] = temp  
   case 15.0:  temp = newtemp()  
               NEWQUAD(4, SYMTBL[ INFO[top-6], 3],  
                          SYMTBL[ INFO[top-4], 3], 0)           // id = init  
               NEWQUAD(7, ADDR + 28, SYMTBL[ INFO[top-3], 3], 0)// goto check_gt  
               NEWQUAD(5, ADDR + 12, , 0)                       // goto check_lt  
/*next:*/      INFO[top-7] = ADDR  
               NEWQUAD(0, SYMTBL[ INFO[top-6], 3],  
                           SYMTBL[ INFO[top-6], 3],  
                           SYMTBL[ INFO[top-3], 3])             // id += step  
               NEWQUAD(7, ADDR + 16, SYMTBL[ INFO[top-3], 3], 0)// goto check_gt  
/*check_lt:*/  NEWQUAD(0, SYMTBL[ temp1, 3],  
                           SYMTBL[ INFO[top-1], 3],  
                           SYMTBL[ INFO[top-6], 3])             // temp = bound - id  
               NEWQUAD(7, ???, SYMTBL[ temp1, 3], 0)            // goto out  
               NEWQUAD(5, ADDR + 12 , 0, 0)                     // goto body  
/*check_gt:*/  NEWQUAD(0, SYMTBL[ temp1, 3],  
                           SYMTBL[ INFO[top-1], 3],  
                           SYMTBL[ INFO[top-6], 3])             // temp = id - bound  
               NEWQUAD(7, ??? , SYMTBL[ temp1, 3], 0)           // goto out  
/*body:*/  
               top -= 6  
   case 12.0:  NEWQUAD(5, INFO[top], 0, 0)  
               MEM[ INFO[top-2] + 13 ] = ADDR  
               MEM[ INFO[top-2] + 21 ] = ADDR  
               top -= 2  
}