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50. Pow(x, n)
题目
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 [−2^31, 2^31− 1]
题目大意
实现 pow(x, n) ,即计算 x 的 n 次幂函数。
解题思路
- 要求计算 Pow(x, n)
- 这一题用递归的方式,不断的将 n 2 分下去。注意 n 的正负数,n 的奇偶性。