C++中数据类型表⽰范围
32位机器环境下结果如下：
Type Size数值范围
⽆值型void0 byte⽆值域
布尔型bool      1 bytetrue  false
有符号短整型short [int] /signed short [int]2 byte-32768~32767
⽆符号短整型unsigned short [int]    2 byte0~65535float数值范围
有符号整型int /signed [int]  4 byte-2147483648~2147483647
⽆符号整型unsigned [int]  4 byte0~4294967295
有符号长整型long [int]/signed long [int]  4 byte-2147483648~2147483647
⽆符号长整型unsigned long [int]  4 byte0~4294967295
long long8 byte0~18446744073709552000
有符号字符型char/signed char  1 byte-128~127
⽆符号字符型unsigned char  1 byte0~255
宽字符型wchar_t (unsigned short.)  2 byte0~65535
单精度浮点型float    4 byte-3.4E-38~3.4E+38
双精度浮点型double8 byte1.7E-308~1.7E+308
long double