Ответы на вопрос:
Uses crt; const n = 5; m = 10; {кол-во столбцов} l = 10; {максимальная длина одной строки/слова} {letters = 'abcdefghijklmnnnnnnnnnnnnopqrstuvwxxxxxxxxxxyzabcdefghijklmnopqrstuvwxyz'; } file_path = 'data.txt'; type smallstring = string[l]; wordsmas = array[1..n, 1..m] of smallstring; var words: wordsmas; i, j, k: integer; function randomword(n: integer): smallstring; var i: integer; s: smallstring; letters: string; begin letters : = 'abcdefghijklmnnnnnnnnnnnnopqrstuvwxxxxxxxxxxyzabcdefghijklmnopqrstuvwxyz'; s : = ''; for i : = 1 to n do s : = s + letters[random(length(letters) - 1) + 1]; randomword : = s; end; function replace(s, find_text, replace_text: smallstring): smallstring; var i: integer; begin repeat i : = pos(find_text, s); if i < > 0 then begin delete(s, i, length(find_text)); insert(replace_text, s, i); end; until i = 0; replace : = s; end; function invert(s: smallstring): smallstring; var i: integer; t: smallstring; begin t : = ''; for i : = 1 to length(s) do t : = s[i] + t; invert : = t; end; function swapcase(s: smallstring): smallstring; var i: integer; begin for i : = 1 to length(s) do if s[i] = upcase(s[i]) then s[i] : = chr(ord(s[i]) + 32) else s[i] : = upcase(s[i]); swapcase : = s; end; procedure printmas(mas: wordsmas; name: string); var i, j: integer; f: text; begin writeln(name); for i : = 1 to n do begin write(i, ': '); for j : = 1 to m do write(mas[i, j]: l, '; '); writeln; end; assign(f, file_path); append(f); writeln(f, name); for i : = 1 to n do begin write(f, i, ': '); for j : = 1 to m do write(f, mas[i, j]: l, '; '); writeln(f); end; close(f); end; begin randomize; clrscr; for i : = 1 to n do for j : = 1 to m do words[i, j] : = randomword(random(l - 5) + 5); {words[i, j] : = 'goodxxmmnn'; } printmas(words, 'original'); for i : = 1 to n do for j : = 1 to m do case i of 1: words[i, j] : = replace(words[i, j], 'n', 'x'); 2: words[i, j] : = replace(words[i, j], 'x', 'm'); 3: words[i, j] : = invert(words[i, j]); 4: words[i, j] : = swapcase(words[i, j]); end; printmas(words, 'new one'); readln; end. проверялось. работает на турбо паскале
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