位转换



unsigned int invert(unsigned int x,int p,int n)实现对x的进行转换,p为起始转化位,n为需要转换的长度,假设起始点在右边.如x=0b0001 0001,p=4,n=3转换后x=0b0110 0001

unsigned int intvert(unsigned int x,int p,int n) //假定p=4,n=3{unsigned int t = 0;unsigned int a = 1;for(int i = 0; i < n; ++i)//循环的目的主要是获得t，n位全1的二进制数{t |= a;       //位或a <<= 1;   }t << =p;   //转换后_t变为1110000x ^= t;       /异或,将原来的位取反return x;}