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) |
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Reference: [https://linuxhint.com/bash_tac_command/ Bash tac command] |
Reference: [https://linuxhint.com/bash_tac_command/ Bash tac command] |
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=={{header|ALGOL W}}== |
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<lang algolw>begin % reverse the order of the lines read from standard input % |
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% record to hold a line and link to the next % |
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record LinkedLine ( string(256) text; reference(LinkedLine) next ); |
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string(256) line; |
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reference(LinkedLine) lines; |
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% allow the program to continue after reaching end-of-file % |
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ENDFILE := EXCEPTION( false, 1, 0, false, "EOF" ); |
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% handle the input % |
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lines := null; |
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readcard( line ); |
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while not XCPNOTED(ENDFILE) do begin |
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lines := LinkedLine( line, lines ); |
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readcard( line ) |
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end while_not_eof ; |
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% show the lines in reverse order % |
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while lines not = null do begin |
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integer len; |
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% find the length of the line with trailing spaces removed % |
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len := 255; |
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line := text(lines); |
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while len > 0 and line( len // 1 ) = " " do len := len - 1; |
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% print the line, note Algol W does not allow variable length substrings % |
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write( s_w := 0, line( 0 // 1 ) ); |
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for cPos := 1 until len do writeon( s_w := 0, line( cPos // 1 ) ); |
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lines := next(lines) |
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end while_lines_ne_null |
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end.</lang> |
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{{out}} |
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<pre> |
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--- Will Rodgers |
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until you can find a rock." |
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saying 'Nice Doggy' |
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"Diplomacy is the art of |
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</pre> |
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=={{header|Factor}}== |
=={{header|Factor}}== |
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