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Text File  |  1991-08-19  |  316b  |  18 lines
  1. > watch(off)
  2. > a = 1
  3. > if vdefined(a) == TRUE
  4. > message('variable "a" DOES exist')
  5. > else
  6. > message('variable "a" DOES NOT exist')
  7. > endif
  8. > if vdefined(z) == TRUE
  9. > message('variable "z" DOES exist')
  10. > else
  11. > message('variable "z" DOES NOT exist')
  12. > endif
  13. > watch(on)
  14. > timeout = 0
  15. > wait()
  16. > end
  17.  
  18.