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Программа с кодирование и декодированием


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Вот написал 2 программы: кодирование и декодирование текстовой информации методом Гронсфельда. Нужна помощь! Нужно их объеденить. Пытался сам, как ни странно не вышло. Переставало работать. И еще вопрос: когда програма записывает в файл результаты кодирования или декодирования она еще почему приписывает к каждой строчке путь до этого файла. Почему? И если можно, сделать какую нибудь меню для выбора: кодирование или декодирования можно было выбирать. Не судите строго, я только начал изучать Pascal, а программа идет как курсовик. Очень нужно. Помогите!

Программа кодирования:

{CodingProgram reads a file S and writes down result in S1}function getnum(c: char): integer;var n: integer;begin case c of'0': n := 0;'1': n := 1;'2': n := 2;'3': n := 3;'4': n := 4;'5': n := 5;'6': n := 6;'7': n := 7;'8': n := 8;'9': n := 9; elsen := -1; end; getnum := n;end;const N1 = 5; { The maximum quantity of lines in a file } N2 = 3; { Quantity of alphabets }var f,f1: text; s,n,s1: string; i,j,k,l,m: integer; c: integer; { The counter of a position in a line of a code } w : array [1..N1] of string; { Lines } w1 : array [1..N1] of string; { Lines } abc : array [1..N2] of string; { Alphabets }begin abc[1] := 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; abc[2] := 'abcdefghijklmnopqrstuvwxyz'; abc[3] := '0123456789'; writeln('*** Coding of the text information by method Gronsfelds ***'); write('Enter a full way to a file from which it is readable: '); readln(s); write('Enter a full way to a file in which we write: '); readln(s1); write('Enter a digital key (4 figures or less): '); readln(n);{} assign(f,s); assign(f1,s1); reset(f); rewrite(f1); i := 1; { Reads a file } while not EOF(f) and (i<=N1) do beginreadln(f,w[i]); w1[i]:=w[i];inc(i); end; { We code }{ 1-st cycle - in the lines from a file }{ 2-nd cycle - on elements in line from a file }{ 3-rd cycle - under alphabets }{ 4-th cycle - on elements of the alphabet } c := 1; for i := 1 to N1 do if ord(w[i][0])<>0 then for j := 1 to (ord(w[i][0])+1) do for k := 1 to N2 do for l := 1 to (ord(abc[k][0])+1) do beginif abc[k][l]=w[i][j] then begin  m := l+getnum(n[c]); inc©; if c>ord(n[0]) then c := 1;  if m>ord(abc[k][0]) then m := m-ord(abc[k][0]);  w1[i][j] := abc[k][m];end; end; for i:=1 to N1 do beginwriteln(w[i]);writeln(w1[i]); end; for i := 1 to N1 do beginfor j := 1 to ord(w1[i][0]) do write(f1,w1[i][j]);writeln(f1,s1,''); end; writeln('Press Enter for an output'); read(s);end.

Программа декодирования

{DecodingProgram reads a file S and writes down result in S1}function getnum(c: char): integer;var n: integer;begin case c of'0': n := 0;'1': n := 1;'2': n := 2;'3': n := 3;'4': n := 4;'5': n := 5;'6': n := 6;'7': n := 7;'8': n := 8;'9': n := 9; elsen := -1; end; getnum := n;end;const N1 = 5; { The maximum quantity of lines in a file } N2 = 3; { Quantity of alphabets }var f,f1: text; s,n,s1: string; i,j,k,l,m: integer; c: integer; { The counter of a position in a line of a code } w : array [1..N1] of string; { Lines } w1 : array [1..N1] of string; { Lines } abc : array [1..N2] of string; { Alphabets }begin abc[1] := 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; abc[2] := 'abcdefghijklmnopqrstuvwxyz'; abc[3] := '0123456789'; writeln('*** Decoding of the text information by method Gronsfelds ***'); write('Enter a full way to a file from which it is readable: '); readln(s); write('Enter a full way to a file in which we write: '); readln(s1); write('Enter a digital key (4 figures or less): '); readln(n);{} assign(f,s); assign(f1,s1); reset(f); rewrite(f1); i := 1; { Reads a file } while not EOF(f) and (i<=N1) do beginreadln(f,w[i]); w1[i]:=w[i];inc(i); end; { We code }{ 1-st cycle - in the lines from a file }{ 2-nd cycle - on elements in line from a file }{ 3-rd cycle - under alphabets }{ 4-th cycle - on elements of the alphabet } c := 1; for i := 1 to N1 do if ord(w[i][0])<>0 then for j := 1 to (ord(w[i][0])+1) do for k := 1 to N2 do for l := 1 to (ord(abc[k][0])+1) do beginif abc[k][l]=w[i][j] then begin  m := l-getnum(n[c]); inc©; if c>ord(n[0]) then c := 1;  if m<1 then m := m+ord(abc[k][0]);  w1[i][j] := abc[k][m];end; end; for i:=1 to N1 do beginwriteln(w[i]);writeln(w1[i]); end; for i := 1 to N1 do beginfor j := 1 to ord(w[i][0]) do write(f1,w1[i][j]);writeln(f1,s1,''); end; writeln('Press Enter for an output'); read(s);end.
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