Reverse the order of lines in a text file while preserving the contents of each line: Difference between revisions
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(Added Algol W) |
(→version 2: updated DO loop to not read the file's contents into an array, used a (temporary) internal work area.) |
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if iFID=='' | iFID=="," then iFID='REVERSEF.TXT' /*Not specified? Then use the default.*/ |
if iFID=='' | iFID=="," then iFID='REVERSEF.TXT' /*Not specified? Then use the default.*/ |
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call lineout iFID /*close file, good programming practice*/ |
call lineout iFID /*close file, good programming practice*/ |
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options |
options nofast_lines_BIF_default /*an option just for Regina REXX. */ |
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#= lines(iFID) /*#: the number of lines in the file. */ |
#= lines(iFID) /*#: the number of lines in the file. */ |
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do j=# by -1 for # /*read file (backwards), from bot──►top*/ |
do j=# by -1 for # /*read file (backwards), from bot──►top*/ |
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say linein(iFID, j) /*display record contents ──► terminal.*/ |
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say @.j /*display a record of the file ──► term*/ |
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end /*j*/ |
end /*j*/ |
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call lineout iFID /*close file, good programming practice*/</lang> |
call lineout iFID /*close file, good programming practice*/</lang> |
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