b4be612832
Change from `uread(0, c, 1)` to `read(c)`, so input goes through libpc's buffer. If input is a tty in Unix, this reduces the number of read(2) system calls from one per character to one per line. This change will become necessary in CP/M when I enable the line editor.
147 lines
2.5 KiB
OpenEdge ABL
147 lines
2.5 KiB
OpenEdge ABL
(* $Source$
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* $State$
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* $Revision$
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*)
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(*$U+ --- enables underscores in identifiers *)
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program hilo(input, output);
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type
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string = packed array [0..255] of char;
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var
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playing : Boolean;
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seed : integer;
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{ This version of Pascal seems to have no random number generator I can find,
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so we have to implement our own here. This is a hacked up and probably
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broken version of the C library generator. }
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procedure randomise(s : integer);
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begin
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seed := s;
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end;
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function random(range : integer) : integer;
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begin
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seed := (20077 * seed + 12345);
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random := seed mod range;
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end;
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{ Pascal doesn't provide string input, so we read characters until the
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end of line and put them in a string. }
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procedure readstring(var buffer : string; var length : integer);
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var
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c : char;
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begin
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write('> ');
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length := 0;
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repeat
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begin
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read(c);
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buffer[length] := c;
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length := length + 1;
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end
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until eoln;
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readln; { discard end of line }
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end;
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procedure getname;
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var
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name : string;
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namelen : integer;
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i : integer;
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seed : integer;
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begin
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writeln;
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writeln('Hi there! I''m written in Pascal. Before we start, what is your name?');
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writeln;
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readstring(name, namelen);
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writeln;
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write('Hello, ');
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seed := 0;
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for i := 0 to (namelen-1) do
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begin
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write(name[i]);
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seed := seed + ord(name[i]);
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end;
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randomise(seed);
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write('! ');
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end;
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procedure game;
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var
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Number : integer;
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Attempts : integer;
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guess : integer;
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begin
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writeln('See if you can guess my number.');
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Number := random(100);
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Attempts := 0;
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guess := -1;
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while guess <> Number do
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begin
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Attempts := Attempts + 1;
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write('> ');
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readln(guess);
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if guess < Number then
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begin
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writeln;
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writeln('Try a bit higher.');
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end;
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if guess > Number then
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begin
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writeln;
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writeln('Try a bit lower.');
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end;
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end;
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writeln;
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write('You got it right in only ', Attempts:0, ' ');
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if Attempts = 1 then
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write('go')
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else
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write('goes');
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writeln('!');
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end;
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function question: Boolean;
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var
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response: char;
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begin
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write('> ');
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readln(response);
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question := not ((response = 'n') or (response = 'N'));
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end;
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begin
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getname;
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playing := TRUE;
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while playing do
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begin
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game;
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writeln;
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writeln('Would you like another go?');
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playing := question;
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writeln;
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if playing then
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write('Excellent! ')
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else
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writeln('Thanks for playing --- goodbye!');
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end;
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end.
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