RosettaCodeData/Task/Letter-frequency/Pascal/letter-frequency.pascal

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program LetterFrequency;
var
textFile: text;
character: char;
counter: array[0..255] of integer;
i: integer;
begin
for i := low(counter) to high(counter) do
counter[i] := 0;
assign(textFile, 'a_text_file.txt');
reset(textFile);
while not eof(textFile) do
begin
while not eoln(textFile) do
begin
read(textFile, character);
inc(counter[ord(character)]);
end;
readln(textFile);
end;
for i := low(counter) to high(counter) do
if counter[i] > 0 then
writeln(char(i), ': ', counter[i]);
end.