What is returned when the readline method reaches the end of the file?

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BlackTom AI · Accepted Answer

We start by restating the question and listing the available options to ensure clarity about what we are evaluating.
Question: What is returned when the readline method reaches the end of the file?
Options: 
, 	, , ""

Option 1: '
' — This represents a newline character. Returning a newline at EOF would imply that there is an additional line break after the end, which is not how EOF typically signals the end of input. Therefore this option describes a character that would appear inside a line, not the signal of reaching the end.
Option 2: '	' — This is a tab character. A tab being returned at EOF would indicate that a tab character exists at the end of the content, which is unrelated to the end-of-file condition. It does not reflect the end of data.
Option 3: '' — This is a carriage return character. In many contexts,  might appear as part of a Windows-style newline (
) within the file, but at EOF the function is signaling that there is no more data to read, not that there is a control character at the end. This option misinterprets the EOF signal.
Option 4: '""' — This represents an empty string (no characters). When a readline method reaches the end of the file, there are no more characters to return, so the conventional behavior is to return an empty string to indicate EOF rather than a newline, tab, or carriage return.
Now, comparing these interpretations, we see that the only option aligned with the EOF convention is the empty string, since no further characters can be read once the end is reached. The other options describe actual characters that could appear within a line, but do not signify EOF. Hence, the empty string best matches the end-of-file condition for a typical readline implementation.

Fal25_CS003C_74229 Ch. 7 Pre-Quiz (Remotely Proctored)

What is returned when the readline method reaches the end of the file?

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