-bit operation

Source: Internet
Author: User

1. Elimination of binary rightmost 1

X & (X-1) 	

1.1 Detect integers with O (1) Time N whether it is 2 the power of th

   BOOL CheckPowerOf2 (int n) {
        //write your code here
        return n > 0 && (N & (n-1)) = = 0;

1.2 The binary number represents the number of 1.

    public int countones (int num) {
        int count = 0;
        while (num! = 0) {
            num = num & (num-1);
        return count;
1.2 Application-If you want to convert an integer A to B, how many bit bits need to be changed

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