C/C++中数据类型在不同平台下所占字节数

标准的32位的系统：

char 1个字节

short 2个字节

int 4个字节

long: 4个字节

float: 4个字节

double: 8个字节

long long: 8个字节

16位，32位，64位平台固定的

float：4个字节

double: 8个字节

跨平台运用

typedef signed char int8_t;

typedef short int16_t;

typedef int int32_t;

typedef long long int64_t;

typedef unsigned char uint8_t;

typedef unsigned short uint16_t;

typedef unsigned int uint32_t;

typedef unsigned long long uint64_t;