231. Power of Two
Easy
Given an integer, write a function to determine if it is a power of two.
Example 1:
Input: 1 Output: true Explanation: 20 = 1
Example 2:
Input: 16 Output: true Explanation: 24 = 16
Example 3:
Input: 218 Output: false
package leetcode.easy;
public class PowerOfTwo {
public boolean isPowerOfTwo(int n) {
if (n <= 0) {
return false;
}
if (n == 1) {
return true;
}
if ((n & (n - 1)) == 0) {
return true;
}
return false;
}
@org.junit.Test
public void test() {
System.out.println(isPowerOfTwo(1));
System.out.println(isPowerOfTwo(16));
System.out.println(isPowerOfTwo(218));
}
}