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C undefined input string length program
(programming.dev)
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It's due to the way getchar() and console input work. When you enter "abcdCTRL+D" on the keyboard, here's what happens:
Think about this scenario: What happens if you only enter "abcd" and not press anything else? The program will still be waiting for more input. It needs to receive a signal telling it to stop with the input and proceed with the code execution. But if you press enter, it won't automatically add a new line to the string, because the new line character is still in the input buffer.
This guy is right. I saw OP's post but I did not have enough time to reply at the time. I came back to reply to OP's post, but you are already right.
Thanks a lot for your answer. This might be because of my shallow understanding of how a buffer works, but I don't understand why EOF isn't consumed by getchar() when the other bytes are consumed. Isn't a char just a number and EOF too (-1 I think)? I probably should try and understand buffers more