question about square brackets

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i curious use of these [] brackets.  my understanding arrays in processing.  i see them quite in arduino programs no mention of "including" processing modules.  is there reference these brackets in arduino?  i understand them fully.  thanks much.

square brackets used arrays in arduino (c/c++) , processing (java).
any c or c++ tutorial provide information on how use them in declaring arrays , accessing array data in arduino.


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