Being software engineers, we use null as a value that is unavailable, unassigned, unknown, or inapplicable. It is neither a zero nor a blank space. A database designer uses a null to indicate a data value that does not exist in the database. A programmer uses a null pointer for an uninitialized, undefined, empty or meaningless value. It is believed that a null reference is probably the worst mistake made in programming. I will argue otherwise. Continue reading
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