14 lines
515 B
QBasic
14 lines
515 B
QBasic
|
10 REM Hailstone (Collatz) sequence - Rosetta Code
|
||
|
|
20 N# = 27
|
||
|
|
30 STEPS = 0
|
||
|
|
40 MAXVAL# = N#
|
||
|
|
50 WHILE N# <> 1
|
||
|
|
60 IF N# / 2 = INT(N# / 2) THEN N# = N# / 2 ELSE N# = 3 * N# + 1
|
||
|
|
70 STEPS = STEPS + 1
|
||
|
|
80 IF N# > MAXVAL# THEN MAXVAL# = N#
|
||
|
|
90 WEND
|
||
|
|
100 REM Hailstone(27) has 111 steps, max value 9232
|
||
|
|
110 IF STEPS <> 111 THEN PRINT "FAIL: expected 111 steps, got"; STEPS : END
|
||
|
|
120 IF MAXVAL# <> 9232 THEN PRINT "FAIL: expected max 9232, got"; MAXVAL# : END
|
||
|
|
130 PRINT "Hailstone OK: 27 ->"; STEPS; "steps, max"; MAXVAL#
|