For example, the int type in C or java uses 32 bits, 4 bytes for storage, and has sign bits. It can store 2 32 different kinds of data. The storable data is in the range of-231~ 231-1,and it will overflow if it exceeds the range.
If unsigned bits are used, the range is 0 ~ 2 32-1.
For a simpler example, if 4 bits are used for storage, only 2 4 =16 kinds of different data can be stored. If there is no sign bit, the storage range is 0~ 15, and it will overflow if it exceeds it. If there is a sign bit, the range is -8~7, and it will overflow if it exceeds it.
In actual programming, some compilers will prompt overflow problems under certain circumstances, but more often they need to deal with overflow problems themselves.
What specific needs can be put forward in the question?