function add(num1,num2){            var sum1=num1^num2;//忽略进位，异或            var sum2=(num1&num2)<<1;//与，移位，进位运算            sum=sum1+sum2;//相加            return sum;        }        console.log(add(12,18));//30

 1 import java.util.Scanner; 2  3  4 public class add { 5     static int sum=0; 6     public static int test(int a,int b){ 7         int sum1=a^b; 8         int sum2=(a&b)<<1; 9         sum=sum1+sum2;10         return sum;11     }12     13     public static void main(String[] args){14         Scanner con=new Scanner(System.in);15         int a=con.nextInt();16         int b=con.nextInt();17         18         System.out.print(test(a,b));19     }20 }