Returns an exclusive or exchanged number. Pow (int x, int Y) is implemented, that is, the power of Y of X.

Question 1: exclusive or exchange of two numbers

Suppose X = 2; y = 3. Our goal is (no tooth decay !!) Exchange the values of X and Y;

Take advantage of exclusive or particularity: x ^ x = 0

That is, the two identical numbers are 0;

 

Solution:

Make x = x ^ y = 2 ^ 3

Make y = x ^ y = 2 ^ 3 ^ 3 = 2 (x = x ^ y)

Make x = x ^ y ^ 2 = 2 ^ 3 ^ 2 = 3 (x = x ^ y; y = 2)

 

Question 2: Implement POW (int x, int y), that is, Power Y of X

The yth power of X is that there are Y x consecutive flights. The Code is as follows:

#include <stdio.h>#include <stdlib.h>int my_pow(int x,int y){        if(x==0) return 0;        int ret=x,i=1;        for(;i<y;i++){            ret=ret*x;            printf("y=%d;ret=%d\n",i+1,ret);        }        return ret;}int main(){  int tmp = my_pow(2,10);  printf("====%d\n",tmp);  return 0;}

Result

[[email protected] Desktop]# ./a.outy=2;ret=4y=3;ret=8y=4;ret=16y=5;ret=32y=6;ret=64y=7;ret=128y=8;ret=256y=9;ret=512y=10;ret=1024====1024[[email protected] Desktop]#