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| program asciitab;
uses CRT;
var i: integer;
x, y : byte;
usr_input : char;
{
* утилитарная функция.
* перевод числа в hex.
}
function ToHex(ch : integer) : string;
const hex_tab : array[0..15] of Char = (
'0','1','2','3','4','5','6','7',
'8','9','a','b','c','d','e','f'
);
var b : integer;
ret : string;
begin
ret := '';
while ch>=16 do
begin
b := ch div 16;
if b=0 then b:= b+1;
ret := ret + hex_tab[b];
ch := ch mod 16;
end;
ret:=ret + hex_tab[ch];
ToHex := ret;
end;
{
* печатает заголовки
}
procedure drawHeaders;
var i: integer;
begin
TextColor(Blue);
for i:=2 to 17 do
begin
GotoXY(1, i); Write(ToHex(i-2));
GotoXY(i, 1); Write(ToHex(i-2));
end;
end;
{
* печатаем таблицу
}
procedure drawTable;
var i, j: integer;
ch : byte;
begin
TextColor(White);
for i:=0 to 15 do
begin
GotoXY(2, i+2);
for j:=0 to 15 do
begin
if (x=j) and (i=y) then
begin
TextBackground(Red);
end
else
begin
TextBackground(Black);
end;
ch := (i shl 4)+j;
if (ch<>7) and (ch<>8) and (ch<>9) and
(ch<>10) and (ch<>13) then
Write(Chr(ch))
else
Write(' ');
end;
end;
TextBackground(Black);
end;
{
* пользовательский ввод
}
function Input : char;
var c : char;
begin
c := ReadKey;
if c = #0 then
c:= ReadKey;
input := c;
end;
{
* печатает инфу о тек символе
}
procedure printCur;
var ch : byte;
t : string[2];
begin
TextColor(White);
TextBackground(Black);
t:='';
ch := (y shl 4)+x;
case ch of
7 : t := '\a';
8 : t := '\b';
9 : t := '\t';
10 : t := '\n';
13 : t := '\r';
end;
GotoXY(1, 20);
if t<>'' then
WriteLn('Char : "',t,'"')
else
WriteLn('Char : "',Chr(ch),'"');
WriteLn('Dec : ',ch);
WriteLn('Hex : ',ToHex(ch));
WriteLn;
Write('For quit press ESC.');
end;
begin
x := 0;
y := 0;
REPEAT
ClrScr;
drawHeaders;
drawTable;
printCur;
usr_input:=Input;
case ord(usr_input) of
{UP} 72: if y<>0 then Dec(y);
{LEFT} 75: if x<>0 then Dec(x) else if y<>0 then begin Dec(y); X:=15; end;
{RIGHT} 77: if x<>15 then Inc(x) else if y<>15 then begin Inc(y); X:=0; end;
{DOWN} 80: if y<>15 then Inc(y);
end;
UNTIL usr_input=#27;
end. |
(
