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Mirror, Mirror on the wall (Posted on 2004-07-15) Difficulty: 3 of 5
Find the lowest positive integer that has its digits reversed after dividing it by 2.

See The Solution Submitted by SilverKnight    
Rating: 2.0000 (2 votes)

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Some Thoughts computer | Comment 4 of 9 |

The following program does not find anything:

DECLARE FUNCTION verify! (a$, b$)
FOR n = 1 TO 999999
  n$ = LTRIM$(STR$(n))
  IF verify(n$, "01258") = 0 THEN
   h$ = ""
   FOR j = 1 TO LEN(n$)
    d$ = MID$(n$, j, 1)
    IF d$ = "5" THEN d$ = "2":  ELSE IF d$ = "2" THEN d$ = "5"
    h$ = d$ + h$
   NEXT
   h = VAL(h$)
   IF 2 * h = n THEN PRINT n
  END IF
NEXT

FUNCTION verify (a$, b$)
 FOR i = 1 TO LEN(a$)
  IF INSTR(b$, MID$(a$, i, 1)) = 0 THEN verify = i: EXIT FUNCTION
 NEXT
 verify = 0
END FUNCTION

 


  Posted by Charlie on 2004-07-15 11:18:31
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