Including signed integer and unsigned integer, divided by data length, including short integer, integer and long integer.

The standard integer type is int. Generally speaking, it only refers to integers, and other integer types are also referred to as integer variables.

The keywords included are:

Short integer long unsigned

There are many other common types of built-in variables, such as:

Unit: unsigned integer

LONG: long integer

WORD: unsigned short integer

DWORD: unsigned long integer