Determine if a given integer is a power of two. A number is a power of two if it can be expressed as 2 raised to some non-negative integer (e.g., 1, 2, 4, 8, 16, 32, ...). Return true if the number is a power of two, false otherwise.
Examples:
Input: num = 1
Output: true
Explanation: 1 is 2^0, which is a power of two
Input: num = 16
Output: true
Explanation: 16 is 2^4, which is a power of two
Input: num = 18
Output: false
Explanation: 18 cannot be expressed as 2 raised to any integer
Input: num = 0
Output: false
Explanation: Zero is not a power of two
Input: num = -4
Output: false
Explanation: Negative numbers cannot be powers of two
Apex Code Editor
Welcome to Lightning Challenge!
How It Works
- • Write your solution in the code editor
- • Connect your Salesforce org to test
- • Submit to check if your solution passes
- • Use hints if you get stuck
Contest Alert
🏆 #CodeEveryDay October 2026 (Oct 4–15)Sponsored by FLXBL
Contest runs October 4 - 15. Complete challenges to climb the leaderboard!
Prizes 1 & 2: Salesforce certification exam voucher — won by random drawing, where every point is a ticket. see all prizes
Only the 12 daily challenges shown during this contest count toward points. Earlier dailies don't carry over.