A + B 问题

yingl · yingl · commit ff1f53263a1e · 2016-08-04T14:30:34.000+08:00
diff --git a/a_b_problem.py b/a_b_problem.py
@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+
+class Solution:
+    """
+    @param a: The first integer
+    @param b: The second integer
+    @return:  The sum of a and b
+    """
+    def aplusb(self, a, b):
+        # write your code here, try to do it without arithmetic operators.
+        import ctypes
+        a = ctypes.c_int32(a).value
+        b = ctypes.c_int32(b).value
+        while b != 0:
+            carry = ctypes.c_int32(a & b).value
+            a = ctypes.c_int32(a ^ b).value
+            b = ctypes.c_int32(carry << 1).value
+        return a
