不用加减乘除计算两个数的加法

package test1;


public class test4 {
	

	public static int Add(int n1,int n2) {
		int sum,carry;
		do {
			sum=n1^n2;
			carry=(n1&n2)<<1;
			n1=sum;
			n2=carry;
		} while (n2!=0);
		return sum;
	}
	
	
	public static void main(String[] args) {

	System.out.println(Add(2,4));
	}

}

int BitAdd(int a, int b)
{
    int Carry = a & b;      // 进位
    int NoCarry = a ^ b; // 非进位
    if (Carry != 0)
        return BitAdd(NoCarry, Carry << 1);
    else
        return NoCarry;
}