C 位 操作
一、C bit
操作(C语言 二进制位
操作)
1.Setting a bit
Use the bitwise OR operator (|
) to set a bit.
number |= 1 << x;
That will set bit x
.
2.Toggling a bit
The XOR
operator (^
) can be used to toggle a bit.
number ^= 1 << x;
That will toggle bit x
.
3.Clearing a bit
Use the bitwise AND operator (&
) to clear a bit.
number &= ~(1 << x);
That will clear bit x. You must invert the bit string with the bitwise NOT operator (~
), then AND it.
4.Checking a bit
To check a bit, shift the number x to the right, then bitwise AND
it:
bit = (number >> x) & 1;
That will put the value of bit x
into the variable bit
5.Changing the nth bit to x
二、C decimal
操作 (C语言 十进制位
操作)
1.Get a 位
和二进制的操作比较类似,其中的<<
(二进制左移
)在10进制里面相当于÷10
。在10进制里面可以用循环来实现。
2.Set a 位
参考:
REFERENCE:How do you set, clear and toggle a single bit in C/C++?