异或交换两个数；实现pow(int x, int y) ,即x的y次方

#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;
}

[root@admin Desktop]# ./a.out
y=2;ret=4
y=3;ret=8
y=4;ret=16
y=5;ret=32
y=6;ret=64
y=7;ret=128
y=8;ret=256
y=9;ret=512
y=10;ret=1024
====1024
[root@admin Desktop]#