How do I simulate an End-of-File (EOF) in the Standard Input Stream (stdin)?

End of File (EOF) in Standard Input Stream (stdin)

Question:

Does stdin have an end-of-file marker? If not, can one be added?

Answer:

EOF in Stdin

stdin does not naturally have an EOF marker. When reading from stdin (e.g., using fread or read), the loop:

while ((c = read(0, buffer, BUFSIZ)) > 0) {
    // ...
}

will not end unless an EOF is explicitly simulated.

Simulating EOF in Stdin

In UNIX systems, press Ctrl D to simulate EOF in stdin. In Windows, press Ctrl Z. This will cause the program to behave as if it had reached the end of an input file.

Redirecting Input

When input is redirected from a file (e.g., program < input.txt), the file itself contains an EOF, so this is not an issue.

Additional Clarification

Stdin without redirection can be considered an infinite file. The end of input must be manually signaled by simulating EOF using Ctrl D or Ctrl Z.

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