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

unsigned int intvert(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){
unsigned int _t = 0;
unsigned int _a = 1;
for(int i = 0; i < n; ++i){
_t |= _a;
_a = _a << 1;
}
_t = _t << p;
x ^= _t;
return x;
}