var
     facing_left = 0
     facing_right = 1 //set a default direction

proc
     Left()
          facing_left = 1
          facing_right = 0
     Right()
          facing_right = 1
          facing_left = 0

//If you wanted to check the direction you could make something like this
//so that you wouldn't need to worry about the actual direction, just the variable. 
//Trust me, it works really well.

proc
     CheckDirection() //1 is right, 0 is left
          if(facing_right)
               return 1
          else
               return 0