The actual value of EOF is compiler-dependent, but it is always assigned a code that is not used by any other character.

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EOF (End Of File) is a special value returned by a program to indicate that no more input is available from a file or input stream. Its actual numeric value is compiler-dependent, meaning it can vary between different compilers, but it is always assigned a unique value that is not used by any other character to ensure it can be distinctly recognized as indicating the end of input.

The Actual Value of EOF Is Compiler-Dependent, but It Is