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1 ' decide randomly whether to define the variable:
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10 IF RND>.5 THEN bloop=-100*RND
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20 ON ERROR GOTO 100
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30 a=@bloop ' try to get a pointer
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40 PRINT "Variable bloop exists and its value is",bloop
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50 PRINT "ABS of bloop is",ABS(bloop)
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90 END
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100 IF ERL=30 THEN PRINT "Variable bloop not defined":RESUME 90
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