signed

问题 The ISO C standard allows three encoding methods for signed integers: two's complement, one's complement and sign/magnitude. What's an efficient or good way to detect the encoding at runtime (or some other time if there's a better solution)? I want to know this so I can optimise a bignum library for the different possibilities. I plan on calculating this and storing it in a variable each time the program runs so it doesn't have to be blindingly fast - I'm assuming the encoding won't change

问题 The ISO C standard allows three encoding methods for signed integers: two's complement, one's complement and sign/magnitude. What's an efficient or good way to detect the encoding at runtime (or some other time if there's a better solution)? I want to know this so I can optimise a bignum library for the different possibilities. I plan on calculating this and storing it in a variable each time the program runs so it doesn't have to be blindingly fast - I'm assuming the encoding won't change

问题 According to http://en.cppreference.com/w/cpp/io/streamsize The type std::streamsize is a signed integral type used to represent the number of characters transferred in an I/O operation or the size of an I/O buffer. As far as I can imagine, a stream's size can never be negative, so, my question is: Why is std::streamsize defined as signed rather than unsigned ? What's the rationale behind? 回答1: The draft C++ standard has the following footnote 296 in section 27.5.2 Types which says:

来源： https://stackoverflow.com/questions/64296318/why-is-int-min-in-limits-h-defined-as-2-147-483-647-1-not-either-2-147-483-64

来源： https://stackoverflow.com/questions/64296318/why-is-int-min-in-limits-h-defined-as-2-147-483-647-1-not-either-2-147-483-64

来源： https://stackoverflow.com/questions/64296318/why-is-int-min-in-limits-h-defined-as-2-147-483-647-1-not-either-2-147-483-64

来源： https://stackoverflow.com/questions/64296318/why-is-int-min-in-limits-h-defined-as-2-147-483-647-1-not-either-2-147-483-64

来源： https://stackoverflow.com/questions/64477750/treating-assembly-registers-as-unsigned-vs-signed

来源： https://stackoverflow.com/questions/64477750/treating-assembly-registers-as-unsigned-vs-signed

问题 I know the WAV file format uses signed integers for 16-bit samples. It also stores them in little-endian order, meaning the lowest 8 bits come first, then the next, etc. Is the special sign bit on the first byte, or is the special sign bit always on the most significant bit (highest value)? Meaning: Which one is the sign bit in the WAV format? ++---+---+---+---+---+---+---+---++---+---+---+---+---+---+---+---++ || a | b | c | d | e | f | g | h || i | j | k | l | m | n | o | p || ++---+---+---