Sum of Two Integers
Calculate the sum of two integers a and b, but you are not allowed to use the operator +
and -
.
Example 1:
Input: a = 1, b = 2
Output: 3
Example 2:
Input: a = -2, b = 3
Output: 1
public class Solution {
public int getSum(int a, int b) {
if (a == 0)
return b;
if (b == 0)
return a;
// If we try to add in binary
// possibilities are 0+1=1,1+0=1,0+0=0
// BUT 1+1 = 10 , it carries over
// now carry handles last part ,where as xor handles the first 3 parts
while (b != 0) {
int carry = a & b;
a = a ^ b;
b = carry << 1;
}
return a;
}
}
Last updated