Real number type, also known as floating point type, is divided into single-precision float type and double-precision float type.

Integers are numeric types without decimals, which are divided into signed/unsigned short integers, signed/unsigned basic integers and signed/unsigned long integers.

In a 32-bit system:

Short integers occupy 2 bytes of storage space, while basic integers and long integers occupy 4 bytes of storage space;

The range of signed/unsigned short integers is-215 ~ (215-1) and 0 ~ (2 16- 1) respectively.

The value ranges of signed/unsigned basic integers are-231~ (231-1) and 0 ~ (2 32- 1) respectively.

The range of signed/unsigned long integers is-231~ (231-1) and 0 ~ (2 32- 1) respectively.

Single precision real type occupies 4 bytes of storage space, and double precision real type occupies 8 bytes of storage space.

The value range of single-precision real type is: 3.4 *10-38 ~ 3.4 *1038 or-(3.4 *10-38 ~ 3.4 *1038).

The value range of double precision real number type is:1.7 *10-308 ~1.7 *10 308 or-(1.7 *10-308 ~)