Predefined identifiers have been given an initial meaning for all programs in the language but are capable of being redefined.
Predefined identifiers are regular identifiers that behave as though they had been specified before another program began. They can therefore be redefined, like every other word, to give them new meanings, but doing so is seldom a wise choice.
An entity in programming is given a name called a "identifier" to assist recognize it throughout the code. Although some predefined Identifiers are incorporated into software, identifiers are frequently established by the developer in order to function effectively.
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