عمل شیفت

بر روی کارکتر ورودی عمل شیفت را انجام می دهد
CLS
DIM a AS STRING
DIM b(100) AS INTEGER
INPUT "enter a string ..."; a$
INPUT "how many shift..."; x
k = LEN(a$)
FOR i = 1 TO k
        temp = ASC(MID$(a$, i, 1))
        FOR j = 0 TO 7 STEP 1
        b(8 * i - j) = temp MOD 2
        temp = temp 2
        NEXT j
NEXT i
FOR d = 8 * k TO 1 STEP -1
b(d + x) = b(d)
NEXT d
FOR q = 1 TO x
b(q) = 0
NEXT q
FOR i = 1 TO k
ar = 1
        FOR j = 8 * i TO 8 * (i - 1) + 1 STEP -1
        tempk = tempk + ar * b(j)
        ar = ar * 2
        NEXT j
        PRINT CHR$(tempk),
        tempk = 0
NEXT i