signed means signed that is negative, unsigned unsigned i.e. no negative
signed is the default display type specified in order to expand the scope of unsigned
i.e. -32768--32767 is an int size range
and is unsigned int 0--6553532767 32768 +
this range is used for the needs of particularly large positive number, simply is not big enough int
signed means signed that is negative, unsigned unsigned i.e. no negative
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Origin blog.csdn.net/qq_44933833/article/details/104916824
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