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As far as I know the smallest unit in C is a byte. Where does this constraint comes from? CPU?
For example, how can I write a nibble or a single bit to a file?
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the (binary) representation of a char (in standard character set) can fit into 1 byte. At the time of the primary development of C , the most commonly available standards were ASCII and EBCDIC which needed 7 and 8 bit encoding, respectively. So, 1 byte was sufficient to represent the whole character set.
If the file has no content, it has a size of zero. The file name is as much a part of the file as your own name is physically a part of you (ie, it isn't).
Eight bits are called a byte. One byte character sets can contain 256 characters.
A zero-byte file is a file that does not contain any data. While most files contain several bytes, kilobytes (thousands of bytes) or megabytes (millions of bytes) of information, the aptly-named zero-byte file contains zero bytes. Usually a file will contain at least a few bytes.
no, you can't... files are organized in bytes, it's the smallest piece of data you can save.
And, actually, that 1 byte will occupy more than 1 byte of space, in general. Depending on the OS, the system file type, etc, everything you save as a file will use at least one block. And the block's size varies according to the file system you're using. Then, this 1-bit will be written as 1 - byte and can occupy as much as 4kB of your disk.
In wikipedia you can read something about the byte being the smallest data unit in many computers.
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