Size of sizeof of each type under 32-bit and 64-bit machines

The running result is as follows: (the difference between the two is marked with blue and red respectively)

 

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Machine Platform: x86_64 Processor

Operating System: Red Hat 4.1.2-14

Compilers: GCC version 4.1.2 20070626

 

Size of char is:                    1

Size of unsigned char is:            1

Size of signed Char is:                1

 

 

Size of int is:                                   
4

Size of short is:                               
2

Size of Long is:                                 
8

Size of long int is:                          
8

Size of signed int is:                         4

Size of unsigned int is:                     4

Size of unsigned long int is:             8

Size of long int is:                    8

Size of unsigned long is:          8

 

 

 

Size of float is:                  4

Size of double is:               8

Size of Long double is:       16

 

 

 

Size of (void *) is:         8

Size of (char *) is:         8

Size of (int *) is:           8

Size of (long *) is:         8

Size of (long *) is: 8

Size of (float *) is:        8

Size of (double *) is:    8

 

 

--------------------------

 

 

 

Machine Platform: x86_32 Processor

Operating System: Windows XP SP2

Compiler:  C ++ compiler that comes with vs2005

 

 

Size of char is:                          1

Size of unsigned char is:            1

Size of signed Char is:         1

 

 

 

Size of int is:                     4

Size of short is:                  2

Size of Long is:                   4

Size of long int is:              4

Size of signed int is:           4

Size of unsigned int is:        4

Size of unsigned long int is:       4

Size of long int is:              8

Size of unsigned long is:      8

 

 

 

Size of float is:                  4

Size of double is:               8

Size of Long double is:        8

 

 

 

Size of (void *) is:       4   

Size of (char *) is:       4

Size of (int *) is:           4

Size of (long *) is:         4

Size of (long *) is: 4

Size of (float *) is:        4

Size of (double *) is:      4

Reference 2:

 Table Format: Below 32-bit machines

Data Type	Description	Bytes	Value Range
Bool	Boolean	1	True, false
Char	Character Type	1	-128 ~ 127
Unsigned char	Unsigned character type	1	0 ~ 255
Short	Short integer	2	-32768 ~ 32767
Unsigned short	Unsigned short integer	2	0 ~ 65535
Int	Integer	4	-2147483648 ~ 2147483647
Unsigned	Unsigned integer	4	0 ~ 4294967295
Long	Long Integer	4	-2147483648 ~ 2147483647
Unsigned long	Unsigned long integer	4	0 ~ 4294967295
Float	Single precision type	4	-3.4 × 10-38 ~ 3.4 × 10-38
Double	Double Precision type	8	-1.7 × 10-308 ~ 1.7 × 10-308
Long double	Long dual-precision type	8	-1.7 × 10-308 ~ 1.7 × 10-308