代码

int plus(int a, int b)
{
	int x=1,d=0,r,c=0;
   while(x<=a&&x<=b){
								r=0;
				   r|=a&b;
				   r|=a&c;
      r|=b&c;
								r&=x;
      c=r<<1;
				   x<<=1;
				   d|=a^b^c;
   }
				d|=c;
				return d;
}

评测结果