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Take C's notes and C's notes

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Take C's notes and C's notes

[Unsigned]

The range of data that an int can store in a 16-bit system is-32768 ~ 32767, while the unsigned data range is 0 ~ 65535. In a computer, integers are stored in the form of supplementary codes. According to the difference of the highest bit, if it is 1, the number of symbols is a negative number; if it is an unsigned number, it is interpreted as a positive number. In addition, if unsigned omitting the next keyword, most compilers will consider it as unsigned int.

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