C++ 类型大小(32bit 与 64bit)

C++ 类型大小 (32bit 与 64bit)

#include <iostream>

int main()
{
    std::cout << "---标准类型大小---" << std::endl;
    std::cout << "short size:              " << sizeof(short) << std::endl;
    std::cout << "int size:                " << sizeof(int) << std::endl;
    std::cout << "unsigned int size:       " << sizeof(unsigned int) << std::endl;
    std::cout << "long size:               " << sizeof(long) << std::endl;
    std::cout << "unsigned long size:      " << sizeof(unsigned long) << std::endl;
    std::cout << "long long size:          " << sizeof(long long) << std::endl;
    std::cout << "unsigned long long size: " << sizeof(unsigned long long) << std::endl;
    std::cout << "size_t size:             " << sizeof(size_t) << std::endl;
    std::cout << "double size:             " << sizeof(double) << std::endl;
    std::cout << "float size:              " << sizeof(float) << std::endl;
    std::cout << "char size:               " << sizeof(char) << std::endl;
    std::cout << "unsigned char size:      " << sizeof(unsigned char) << std::endl;
    std::cout << "signed char size:        " << sizeof(signed char) << std::endl;
    std::cout << "pointer size:            " << sizeof(void*) << std::endl;

    std::cout << std::endl;
    std::cout << "---自定义类型大小---" << std::endl;
    std::cout << "SHORT(short) size:               " << sizeof(short) << std::endl;
    std::cout << "INT(int) size:                   " << sizeof(int) << std::endl;
    std::cout << "LONG(long) size:                 " << sizeof(long) << std::endl;
    std::cout << "UINT8(unsigned char) size:       " << sizeof(unsigned char) << std::endl;
    std::cout << "UINT16(unsigned short) size:     " << sizeof(unsigned short) << std::endl;
    std::cout << "UINT32(unsigned int) size:       " << sizeof(unsigned int) << std::endl;
    std::cout << "UINT64(unsigned long long) size: " << sizeof(unsigned long long) << std::endl;
    std::cout << "INT8(char) size:                 " << sizeof(char) << std::endl;
    std::cout << "INT16(short) size:               " << sizeof(short) << std::endl;
    std::cout << "INT32(int) size:                 " << sizeof(int) << std::endl;
    std::cout << "INT64(long long) size:           " << sizeof(long long) << std::endl;
    std::cout << "FLOAT(float) size:               " << sizeof(float) << std::endl;
    std::cout << "DOUBLE(double) size:             " << sizeof(double) << std::endl;
    std::cout << "CHAR(char) size:                 " << sizeof(char) << std::endl;
    std::cout << "BOOL(int) size:                  " << sizeof(int) << std::endl;
    std::cout << "BYTE(unsigned char) size:        " << sizeof(unsigned char) << std::endl;
    std::cout << "HANDLE(void*) size:              " << sizeof(void*) << std::endl;

    return 0;
}

类型	VS2010 32bit	VS2010 64bit	VS2019 32bit	VS2019 64bit	Linux 32bit	Linux 64bit	备注
short	2	2	2	2		2
int	4	4	4	4		4
long	4	4	4	4		8	不同
long long	8	8	8	8		8
unsigned short	2	2	2	2		2
unsigned int	4	4	4	4		4
unsigned long	4	4	4	4		8	不同
unsigned long long	8	8	8	8		8
size_t	4	8	4	8		8	不同
char	1	1	1	1		1
signed char	1	1	1	1		1
unsigned char	1	1	1	1		1
float	4	4	4	4		4
double	8	8	8	8		8
pointer	4	8	4	8		8	不同
SHORT(short)	2	2	2	2		2
INT(int)	4	4	4	4		4
LONG(long)	4	4	4	4		8	不同
UINT8(unsigned char)	1	1	1	1		1
UINT16(unsigned short)	2	2	2	2		2
UINT32(unsigned int)	4	4	4	4		4
UINT64(unsigned long long)	8	8	8	8		8
INT8(char)	1	1	1	1		1
INT16(short)	2	2	2	2		2
INT32(int)	4	4	4	4		4
INT64(long long)	8	8	8	8		8
FLOAT(float)	4	4	4	4		4
DOUBLE(double)	8	8	8	8		8
CHAR(char)	1	1	1	1		1
BOOL(int)	4	4	4	4		4
BYTE(unsigned char)	1	1	1	1		1
HANDLE(void*)	4	8	4	8		8	不同

结论:

1. size_t、pointer、long、unsigned long、HANDLE这三种类型在32bit和64bit的大小有差别。