剑指Offer47 不用加减乘除做加法

 /*************************************************************************
     > File Name: 47_AddTwoNumbers.c
     > Author: Juntaran
     > Mail: JuntaranMail@gmail.com
     > Created Time: 2016年09月04日 星期日 21时33分07秒
  ************************************************************************/

 #include <stdio.h>

 // 移位求两数相加
 int ADD(int num1, int num2)
 {
     int sum, carry;
     if (num1 == )
         return num2;
     if (num2 == )
         return num1;

     while (num2 != )
     {
         sum = num1 ^ num2;
         carry = (num1 & num2) << ;

         num1 = sum;
         num2 = carry;
     }
     return sum;
 }

 int main()
 {
     int num1 = ;
     int num2 = ;

     int sum = ADD(num1, num2);
     printf("sum is %d\n", sum);
     return ;
 }