c - When uses unsigned data type? -

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this question has answer here:

when need use unsigned data type , when signed data type in c? , want know why , how decide 1 need.

use signed data types when need variable hold negative values. careful overflows, signed integer overflows result in undefined behavior.

use unsigned data types when know variable holds non-negative values, or bit patterns. generally, can hold higher maximum value signed data type of equal size. unsigned integer overflows wraparound.


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