各类型的数据范围
char -128 ~ +127 (1 Byte)
short -32767 ~ + 32768 (2 Bytes)
unsigned short 0 ~ 65535 (2 Bytes)
int -2147483648 ~ +2147483647 (4 Bytes) -2^31 ~ 2^31-1
unsigned int 0 ~ 4294967295 (4 Bytes) 0 ~ 2^32-1
long long -9223372036854775808 ~ +9223372036854775807 (8 Bytes) -2^63 ~ 2^63-1
double 1.7 * 10^308 (8 Bytes)
long long的最大值:9223372036854775807
long long的最小值:-9223372036854775808
unsigned long long的最大值:18446744073709551615 0 ~ 2^64-1
__int64的最大值:9223372036854775807
__int64的最小值:-9223372036854775808
unsigned __int64的最大值:18446744073709551615