-- A guessing game
-- Demonstrates some if and case statements
-- Shows if, if-else, if,elsif,else

with ada.text_io; use ada.text_io; 
with ada.integer_text_io; use ada.integer_text_io; 
 
procedure if_and_case  is 
    value_to_guess: constant := 23;
    n: Integer;
    guesses: Natural;
    got_it: Boolean;
begin
    guesses := 0;
    loop
        put("Enter an integer: ");
        get(n);
       
        guesses := guesses + 1;

        if n <= 0 then
            put_line("You think outside the box - I like that!");
        end if;  -- End if required

        if abs n < 1000 then
            put_line("You like to think small!!");
        else
            put_line("You like to think big!!");
        end if;

        if n < value_to_guess then
            put_line("Too small.");
            put_line("You need to think bigger!.");
        elsif n >  value_to_guess then 
            put_line("Too large.");
            put_line("Scale it back!!.");
        else  -- else optional 
            put_line("You got it!");
            got_it := true;
        end if;

        exit when got_it;
    end loop;

    case guesses is
        when 0 => 
            put_line("Oh no, something's wrong!");   -- No break!
        when 1 => 
            put_line("Wow!  You got it first time!");
        when 2 | 4 | 6 | 8 | 10 => 
            put_line("Wow!  Only a few guesses!");
            put_line("You seem quite even tempered!");
        when 3 | 5 | 7 | 9 => 
            put_line("Wow!  Only a few guesses!");
            put_line("You must have an odd strategy!");
        when 11 .. 20 => 
            put_line("Binary search helps, doesn't it!");
        when 21 .. 23 | 25 => 
            put_line("We needed one more example!");

        when others =>    -- Required if not all values accounted for
            put_line("Remember to use binary search strategy!");
    end case;

end  if_and_case;