hasch

#hasch

##Syntax hasch : boolean

##Description The hasch procedure is used to determine if there is a character that has been typed but not yet been read.

##Example This program simulates the rolling of a pair of dice until theuser pressed the keyboard.

    put "Press any key to stop the dice rolling"
    var die1, die2 : int
    var ch : string (1)
    loop
        exit when hasch
        randint (die1, 1, 6)
        randint (die2, 1, 6)
        locate (1, 1)
        put "You rolled ", die1 + die2
    end loop
        
    getch (ch)    % Discard the character

##Details The screen should be in a "graphics" mode. See the setscreen procedure for details. If the screen is not in "graphics" mode, it will automatically be set to "graphics" mode.

If there is the possibility that there are already keystrokes in thekeyboard buffer, the input_flush.htmlcommand can be used to flush the keyboard buffer (remove all keystrokes from the buffer) before entering the loop to check forinput.

##See also getch.html and getchar.html.

See also the input_flush.htmlcommand for flushing the keyboard buffer.

See also predefined unit inputmodule.html.