Solution to Lesson 9

( This code can be found at .\tutorial\Lesson9\LetterCount.bas )

'---------------------
'- Declare variables -
'---------------------

DIM Phrase$ '       the sentence to be scanned
DIM Ascii% '        ASCII value counter 65 to 90
DIM LetterCount% '  number of each letter found
DIM Count% '        length of string counter

'----------------
'- Main program -
'----------------

PRINT "Letter Count" '                                     print directions
PRINT "------------"
PRINT "Type in a sentence to be scanned."
LINE INPUT "> ", Phrase$ '                                 get sentence to be scanned
PRINT
PRINT "Letters found:"
Phrase$ = UCASE$(Phrase$) '                                convert sentence to upper case
FOR Ascii% = 65 TO 90 '                                    cycle from A to Z in ASCII table
    LetterCount% = 0 '                                     reset letter counter
   FOR Count% = 1 TO LEN(Phrase$) '                        cycle through the length of the string
       IF ASC(MID$(Phrase$, Count%, 1)) = Ascii% THEN '    does this letter = current ASCII value?
            LetterCount% = LetterCount% + 1 '              yes, increment the letter counter
       END IF
   NEXT Count%
   IF LetterCount% THEN '                                  was this letter found?
       PRINT CHR$(Ascii%); " ->"; LetterCount% '           yes, print result to the screen
   END IF
NEXT Ascii%