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real language
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Language QuickBASIC
(boolean algebra, "four phrase" logic)
| Date: | 01/19/08 |
| Author: | Al Boulley |
| URL: | n/a |
| Comments: | 1 |
| Info: | n/a |
| Score: |  (3.00 in 27 votes) |
'set fridge capacity, beverage type, and container type
X = 99
B$ = "beer"
C$ = "bottle"
'build number strings so "0" can be sung correctly in second to last verse
DIM N$(X)
FOR L = 1 TO X
N$(L) = LTRIM$(STR$(L))
NEXT
N$(0) = "no more"
'fully stock the fridge, and then start singing!
F = X
DO
'each verse has four "phrases"
FOR P = 1 TO 4
SELECT CASE P:
'three phrases are very similar - first, second, and fourth
CASE 1, 2, 4:
'use some boolean algebra to handle the "what-ifs":
PRINT N$(F); " "; C$; LEFT$("s", -(F <> 1)); " of "; B$;
'-(F=1) evaluates to 1 when F=1.... [-(-1)]
' 0 when F<>1... [-(0) ]
'(don't want to pluralize a lone container)
PRINT LEFT$(" on the wall", -12 * (P <> 2));
'-12*(P<>2) evaluates to 0 when P=2.... [-12*(0) ]
' 12 when P<>2... [-12*(-1)]
'(don't want to sing those words in the second phrase)
PRINT MID$(", ." + CHR$(13), 3 + 2 * (P = 1), 2);
'3+2*(P=1) evaluates to 1 when P=1.... [3+2*(-1)]
' 3 when P<>1... [3+2*(0) ]
'(brief pause after first phrase, long pause after other two)
'[using length of zero with Left$ results in empty string]
'third phrase of the song never changes
CASE 3:
PRINT "Take one down and pass it around, ";
F = F - 1
END SELECT
NEXT
'take an extra breath between verses
PRINT
'F evaluates to FALSE when F=0 [exactly zero is always FALSE]
' TRUE when F<>0 [every nonzero is always TRUE]
'(continue singing verses until fridge is empty)
LOOP WHILE F
'sing final verse the easy way
PRINT "No more "; C$; "s of "; B$; " on the wall, no more "; C$; " of "; B$; "."
PRINT "Go to the store and buy some more, "; N$(X); " "; C$; "s of "; B$; " on the wall."
'boolean algebra is your friend :)
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