CASE usage

El Paisa

I quite understand the manual entry about CASE.
I wonder if somebody give me a couple of examples of the use of CASE.
I really appeciate.

Graham Stabler

case kb.getkey
      $C0: on_time := on_time - 10 #>14        ' Left arrow (limited to 14 clock cycles min)
      $C1: on_time := on_time + 10             ' Right arrow
      $C2: off_time := off_time + 10           ' Up arrow
      $C3: off_time := off_time - 10 #>57      ' Down arrow (limited to 57 clock cycles min)

This is from the object that produces pulses that I posted:

http://forums.parallax.com/forums/default.aspx?f=25&m=139628

it gets the code for the key pressed using the getkey method and compares it to $C0 to $C3 in turn. If for example the key was the right arrow, kb.getkey would be $C1 and the code "on_time := on_time + 10 " would be run.

Once one of the cases is found to be true no others are checked and it jumps to the next part of the program.

Graham

Graham Stabler

p.s. The #> makes sure that on_time can be no smaller than 14 and the #>57 makes sure the off time can be no smaller than 57.