How many bytes does double occupy?

The bytes occupied by double: 1. Under the 16-bit compiler, the double occupies 8 bytes; 2. Under the 32-bit compiler, the double occupies 8 bytes; 3. Under the 64-bit compiler, double occupies 8 bytes.

#The operating environment of this article: windows10 system, thinkpad t480 computer.

Bytes occupied by double:

1. 16-bit compiler

• char: 1 byte

• char* (i.e. pointer variable): 2 bytes

• short int : 2 bytes

• int: 2 bytes

• unsigned int: 2 bytes

• float: 4 Bytes

• double: 8 bytes

• long: 4 bytes

• long long: 8 bytes

• unsigned long: 4 bytes

##2, 32 Bit compiler

• char: 1 byte

• char* (i.e. pointer variable): 4 bytes (32 The bit addressing space is 2^32, which is 32 bits, which is 4 bytes. The same applies to 64-bit compilers)

• short int: 2 bytes

• int: 4 bytes

• unsigned int: 4 bytes

• float: 4 Bytes

• double: 8 bytes

• long: 4 bytes

• long long: 8 bytes

• unsigned long: 4 bytes

3. 64-bit compiler

• char: 1 byte

• char* (i.e. pointer variable): 8 bytes

• short int: 2 bytes

• int: 4 bytes

• unsigned int : 4 bytes

• float: 4 bytes

• ##double: 8 bytes

long: 8 bytes
long long: 8 bytes
unsigned long: 8 Bytes

php training

column!

The above is the detailed content of How many bytes does double occupy?. For more information, please follow other related articles on the PHP Chinese website!