_bittest & _bittestandset
2009-11-08 03:44
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C 中的unsigned 类型默认为unsigned int类型。unsigned char为8bit都使用,没有符号位。
char < unsigned char < int < unsigned int
_bittest, _bittest64 在vs2005以后支持,返回值为unsigned char,如果要得到0或1的值需要进行强制类型转换。检查地址a中,第b位的值是0还是1。注意到b的值从0开始取,如果判断int 类型的最高位,就用b=32-1;
Generates the bt instruction, which examines the bit in position b of address a, and returns the value of that bit.
unsigned char _bittest( long *a, long b);unsigned char _bittest64( __int64 *a, __int64 b);
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char < unsigned char < int < unsigned int
_bittest, _bittest64 在vs2005以后支持,返回值为unsigned char,如果要得到0或1的值需要进行强制类型转换。检查地址a中,第b位的值是0还是1。注意到b的值从0开始取,如果判断int 类型的最高位,就用b=32-1;
Generates the bt instruction, which examines the bit in position b of address a, and returns the value of that bit.
unsigned char _bittest( long *a, long b);unsigned char _bittest64( __int64 *a, __int64 b);
本文使用Blog_Backup未注册版本导出,请到soft.pt42.com注册。
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