RosettaCodeData/Task/ABC-problem/XPL0/abc-problem.xpl0

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string 0;
char Side1, Side2;
def Size = 20;
char Avail(Size);
func CanMakeWord(Word); \returns 'true' if blocks can make Word
char Word;
int I, Let;
[Let:= Word(0) & $5F; \get letter and make sure it's uppercase
if Let = 0 then return true; \if 0 then end of word; return successful
for I:= 0 to Size-1 do \scan for block that contains letter
if Avail(I) and (Side1(I) = Let or Side2(I) = Let) then
[Avail(I):= false;
if CanMakeWord(Word+1) then return true;
];
return false;
];
int I, J, Words;
[Side1:= "BXDCNGRTQFJHVAOEFLPZ";
Side2:= "OKQPATEGDSWUINBRSYCM";
Words:= ["A", "bark", "Book", "Treat", "Common", "Squad", "conFuse"];
for J:= 0 to 6 do
[Text(0, "Can make ^""); Text(0, Words(J)); Text(0, "^": ");
for I:= 0 to Size-1 do Avail(I):= true;
Text(0, if CanMakeWord(Words(J)) then "True" else "False"); CrLf(0);
];
]