![]() They must begin with a letter, which may be followed by any combination and numbers of letters and digits. Identifiers are names denoting constants, types, bounds, variables, procedures, and functions. ![]() You may not reverse or rearrange its items without the tuple rendering to be different.Īfter you have declared an identifier to refer to one thing, you may not re-declare the same identifier to refer to another (or same) thing (“shadowing” may apply, but more on that later). ![]() In Pascal, before you are even allowed to use any variable or constant you have to declare them, like virtually any symbol in Pascal.Ī declaration makes a certain symbol known to the compiler and possibly instructs it to make the necessary provisions for their effective usage, that means – in the context of variables – earmark some piece of memory.Ī declaration is always a two-tuple ( identifier, definition ) tuples.
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