May 08, 2019 , ,
QBASIC Program to print the given string in reverse order

CLS
INPUT "Enter any String "; s$
FOR i = LEN(s$) TO 1 STEP -1
    r$ = MID$(s$, i, 1)
    b$ = b$ + r$
NEXT i
PRINT "Reverse Order = "; b$
END

Using SUB .... END SUB

DECLARE SUB revf(s$)
CLS
INPUT "Enter any String "; s$
CALL rev(s$)
END

SUB rev (s$)
    FOR i = LEN(s$) TO 1 STEP -1
        r$ = MID$(s$, i, 1)
        b$ = b$ + r$
    NEXT i
    PRINT "Reverse Order = "; b$
END SUB



Using FUNCTION ... END FUNCTION

DECLARE FUNCTION rev$(s$)
CLS
INPUT "Enter any string "; s$
re$ = rev$(s$)
PRINT "Reverse Order = "; re$
END

FUNCTION rev$ (s$)
    FOR i = LEN(s$) TO 1 STEP -1
        r$ = MID$(s$, i, 1)
        b$ = b$ + r$
    NEXT i
    rev$ = b$
END FUNCTION


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