"Sword Pointing Offer" Java Implementation - Integer Power of Numerical Values

topic

Given a float base of type double and an integer exponent of type int. Find the exponent power of base.

ideas

This topic is relatively simple, the main attention is to think comprehensively, the positive number, negative number of the index, and the situation of 0.

code

public class Solution {
    public double Power(double base, int exponent) {
   double result = 1;
        if (exponent > 0) {
            for (int i = 0; i < exponent; i++) {

                result = base * result;
            }
        } else if ((exponent < 0)) {
            double dao = 1 / base;
            int ex = -exponent;
            for (int i = 0; i < ex; i++) {

                result = result * dao;
            }

        } else {
            return 1;
        }

        return result;
  }
}