Knowledge Base |

# CLEAR Should Not Be Used in Event Trap

Article ID: 12074

Article Last Modified on 11/21/2006

This article was previously published under Q12074

## SUMMARY

The presence of a CLEAR statement in the following event handling routine generates an "Illegal function call" error at compile time:

          CLEAR ,,800
          KEY(2) ON
          ON KEY(2) GOSUB 200
          WHILE INKEY$="" : WEND
          PRINT "this is a test"
          END
      200 CLEAR ,,800
          PRINT "this worked"
          RETURN

The error occurs because the CLEAR statement changes the stack. The CLEAR statement is not allowed in an event handler because it would destroy the return address.

Additional query words: QuickBas BasicCom

Keywords: KB12074