C++中二进制转换右移算法解释

2025-02-27 01:29:18
推荐回答(1个)
回答(1):

ulong bit=~(ULMAX>>1);

这里定义一个bit 最高位为1 其余全是0 目的是为了可以从左至右 从高位到低位 逐位取到2进制值
bit 形如 1000 0000 0000 0000 0000 0000 0000 0000

while(bit){
os<<(b.n & bit ? '1': '0');
bit>>=1;}
字面意思很好理解了 bit永远只有一位是1 并且不断右移 直到bit移到的变成0

bit移动一次变成 0100 0000 0000 0000 0000 0000 0000 0000
bit移动两次变成 0010 0000 0000 0000 0000 0000 0000 0000

每次移动 都会跟源值(b.n)进行按位与运算 也就是取出 bit 为1的那一位的值 是1 还是0
如果是1 打印"1" 如果是0 打印 "0"

理解了没有?

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