Java basic type

In Java, there are eight basic data types:

1) The 31 Power of int 4 bytes (byte)-2 to the 31 power of 2-1

2) short 2 bytes (byte)-the 15th power of 2 to the 15th power of 2-1

3) long 8 bytes (byte)-power 63 of 2 to power 63 of 2-1

4) byte 1 byte-the 7th Power of 2 to the 7th Power of 2-1

5) float 4-byte 7-bit valid number

6) double 8-byte 16-bit valid number

7) char 2 bytes (byte)

8) boolean

1 byte = 8 bits

Type ------- symbol digit ------------- exponent digit -------------- tail digit ----

Float --- 31st (1bit) --- 30-23 (8bit) ---- 22-0 (23bit)

Double -- 63rd bits (1bit) --- 62-52 bits (11bit) --- 51-0 bits (52bit)

The value range mainly depends on the index:

The float index is 8 bits (2 ^ 8). Because it is signed, the corresponding index range is-128 ~ 128.

The index of double has 11bit (2 ^ 11). Because it is signed, the corresponding index range is-1024 ~ 1024.

The index range of the float index is-128 ~ 128, so the value range is-2 ^ 128 to 2 ^ 128, which is approximately-3.4E38-+ 3.4E38

Precision (valid number) mainly depends on the ending number:

The ending number of float is 23bit, corresponding to 7 ~ 8-bit decimal number, so some compilers for valid numbers are 7-bit, and some are 8-bit.

 

Common Data Types in C Language

1) int 2 bytes

2) short 2 bytes

3) long 4 bytes

4) unsigned 2 bytes

5) float 4 bytes

6) double 8 bytes

7) Char 1 byte

8) boolean

 

Common Data Types in C ++

1) bool

2) char 1 byte

3) wchar_t 2 bytes

4) short 2 bytes

5) int 2 bytes

6) long 4 bytes

7) float 6-digit valid number

8) double 10-digit valid number

9) long double 10-digit valid number