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How do I read words in the reverse order reading from another file?

Posted on 2002-03-08
3
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Last Modified: 2010-04-16
The Program below Program copies data from one file to another.So the question is, How is how do I read that data in the reverse order and the program should keep record of the maximum sentense used and this should be done using an array.I use a 7.0 Pascal.

Program Copyfiles;

var
   Indata,
   Outdata:text;
   next:char;
   sname,tname:string;

 
begin

write('Enter the name of the source file :');
readln(sname);
write('Enter the name of the the target file :');
readln(tname);
if (sname = tname) then
write('The files are identical, they can''t be copied')
else
begin
Assign(Indata,'a:\source.dat');
Assign(Outdata,'a:\target.dat');
reset(Indata);
rewrite(outdata);
while not eof(Indata) do
begin
read(Indata,next);
write(outdata,next);

end;{while}

close(Indata);
close(Outdata);
writeln('Input file copied to output file, press < Enter > ')
end;
readln
end.

0
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Question by:ktpule
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3 Comments
 
LVL 6

Accepted Solution

by:
kotan earned 100 total points
ID: 6850067
Use recursive method,

..
wc(Indata, outdata, #0);
..

procedure wc(Indata, outdata: text, next: char)
var
  newChar: char;
begin
  if eof(Indata) then
    write(outdata, next)  
  else
  begin
    read(Indata, newChar);
    wc(Indata, outdata, newChar);
    write(outdata, newChar);
  end;

end;
0
 
LVL 1

Expert Comment

by:Moondancer
ID: 6858499
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Expert Comment

by:Netminder
ID: 6905980
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