剑指Offer09 数值的整数次方

 /*************************************************************************
     > File Name: 09_Power.c
     > Author: Juntaran
     > Mail: JuntaranMail@gmail.com
     > Created Time: 2016年08月29日 星期一 21时07分21秒
  ************************************************************************/
 
 #include <stdio.h>
 
 double Power(double base, int exponent)
 {
     if (base == )
         return ;
     if (exponent == )
         return ;
     if (exponent == )
         return base;
 
     int x = abs(exponent);
     double r = 1.0;
 
     while (x)
     {
         if (x & )
             r *= base;
         base *= base;
         x >>= ;
         printf("r is %f\n base is %f\n x is %d\n", r, base, x);
     }
     return exponent< ? /r : r;
 }
 
 int main()
 {
     double base = ;
     int exponent = ;
     double ret = Power(base, exponent);
     printf("ret is %f\n", ret);
 
     return ;
 }