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C++学习——int、long、long long, double, long double等的占用空间及取值范围
2021-07-20 03:55:26 【流楚丶格念】
unsigned int 0~4294967295
int 2147483648~2147483647
unsigned long 0~4294967295
long 2147483648~2147483647
long long的最大值:9223372036854775807
long long的最小值:-9223372036854775808
unsigned long long的最大值:1844674407370955161
__int64的最大值:9223372036854775807
__int64的最小值:-9223372036854775808
unsigned __int64的最大值:18446744073709551615
输出结果为:
注意:
一字节表示八位,即:1byte = 8 bit;
int: 4byte = 32 bit 有符号signed范围:2^31-1 ~ -2^31即:2147483647 ~ -2147483648无符号unsigned范围:2^32-1 ~ 0即:4294967295 ~ 0
long: 4 byte = 32 bit 同int型
double: 8 byte = 64 bit 范围:1.79769e+308 ~ 2.22507e-308
long double: 12 byte = 96 bit 范围: 1.18973e+4932 ~ 3.3621e-4932
float: 4 byte = 32 bit 范围: 3.40282e+038 ~ 1.17549e-038
int、unsigned、long、unsigned long 、double的数量级最大都只能表示为10亿,即它们表示十进制的位数不超过10个,即可以保存所有9位整数。而short只是能表示5位;
版权声明
本文为[流楚丶格念]所创,转载请带上原文链接,感谢
https://blog.51cto.com/u_15265965/2892168
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