Implement pow(x, n), which calculates x raised to the power n (xn).
Example 1:
Input: 2.00000, 10 Output: 1024.00000 Example 2:
Input: 2.10000, 3 Output: 9.26100 Example 3:
Input: 2.00000, -2 Output: 0.25000 Explanation: 2-2 = 1/22 = 1/4 = 0.25 Note:
-100.0 < x < 100.0 n is a 32-bit signed integer, within the range [−231, 231 − 1]
class Solution { public double myPow(double x, int n) { double result=1.0; for(int i=n;i!=0;i/=2) { if(i%2!=0)result*=x; x*=x; } return n<0?1/result:result; } }