HP SunSoft Pascal 4.0 Manual de usuario descargar pdf (Pagina 36)

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101

12 Pascal 4.0 User’s Guide

Using the same program, but with the < operator to redirect input, you can

print the ﬁle on the terminal:

Using a File Name as a File Variable

You can also redirect the output by listing the ﬁle as a ﬁle variable in the

program statement. The Pascal library associates the ﬁle variable with a ﬁle of

the same name. For example, copy2.p lists data as the input ﬁle variable:

hostname% copy < data

hello, are you listening?

goodbye, I must go now.

program copy2(data, output);

{ This program redirects input. }

var

c: char;

data: text;

begin

reset(data);

while not eof(data) do begin

while not eoln(data) do begin

read(data, c);

write(c)

end;

readln(data);

writeln

end

end. { copy2 }

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HP SunSoft Pascal 4.0 Manual de usuario Pagina 36

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