1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | class Solution {public: double Power(double base, int exponent) { int isOdd; if(0.0==base)return 0; if(exponent>0) {} else if(exponent<0) { exponent=-exponent; base=1.0/base; } else return 1; if(exponent==1)return base; if(exponent &0x01 )isOdd=1;//指数是奇数 int times; if(isOdd) times=log(exponent-1)/log(2); else times=log(exponent)/log(2); double result=base; while(times--) { result=result*result; } if(isOdd) result=result*base; return result; }}; |
原文：http://www.cnblogs.com/zhxshseu/p/5285163.html