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$rocks[0] = 'bedrock'; # One element... $rocks[1] = 'slate'; # another... $rocks[2] = 'lava'; # and another... $rocks[3] = 'crushed rock'; # and another... $rocks[99] = 'schist'; # now there are 95 undef elements print '$rocks[0]='.$rocks[0].".\n"; print '$rocks[1]='.$rocks[1].".\n"; print '$rocks[2]='.$rocks[2].".\n"; print '$rocks[3]='.$rocks[3].".\n"; print '$rocks[99]='.$rocks[99].".\n"; print "\n"; print '$rocks[4]='.$rocks[4].".\n"; print '$rocks[101]='.$rocks[101].".\n"; print '$rocks[1001]='.$rocks[1001].".\n"; $end = $#rocks; # 99, which is the last element's index $number_of_rocks = $end + 1; # okay, but you'll see a better way later print "The number of rocks is ".$number_of_rocks.".\n"; #$rocks[ -1 ] = 'hard rock'; # easier way to do that last example #$dead_rock = $rocks[-100]; # gets 'bedrock' #$rocks[ -200 ] = 'crystal'; # fatal error! print '$rocks[-1]='.$rocks[-1].".\n"; print '$rocks[-100]='.$rocks[-100].".\n"; print '$rocks[-200]='.$rocks[-200].".\n"; $rocks[199] = 'granite'; print '$rocks[0]='.$rocks[0].".\n"; $rocks[-200] = 'crystal'; # fatal error! print '$rocks[0]='.$rocks[0].".\n";