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I'm following examples in the book Head First C, and I'm supposed to enter strings at the command line for the program to encrypt, then ctrl-D when I'm done. But ctrl-D doesn't have any effect.

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Have you tried pressing it twice? –  Daniel Beck Aug 25 '13 at 19:37
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Untried, but does control-Z work? (Control-D is end if file/end of input on most systems. But on DOS/Windows it is control-Z). –  Hennes Aug 25 '13 at 19:49

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