signed int是什么

Signed integers, also known as signed types or simply signeds[^1], are integer data types that have a defined range that includes both positive and negative values. Unlike their unsigned counterparts, they include a special value called "zero" and a negative range to represent the absence of a positive number or a loss of magnitude. In programming languages like C and C++, `int` type by default is signed (often referred to as `signed int`), with a typical range of -2147483648 to 2147483647, which is half the size of its unsigned counterpart's range due to the inclusion of negative numbers. This means you can store more distinct values in an unsigned int compared to a signed int of the same bit width.