Given a decimal integer and a target base (2 through 16), convert the number to its string representation in the target base. Use uppercase letters A through F for digits 10 through 15 in bases greater than 10. Preserve the negative sign for negative numbers. Return null for null input or invalid base values outside the range 2 to 16.
public static String convertToBase(Integer inputNumber, Integer toBase)
Examples:
Input: inputNumber = 10, toBase = 2
Output: '1010'
Explanation: 10 in binary is 1010
Input: inputNumber = 255, toBase = 16
Output: 'FF'
Explanation: 255 in hexadecimal is FF
Input: inputNumber = 0, toBase = 8
Output: '0'
Explanation: Zero is zero in any base
Input: inputNumber = -42, toBase = 2
Output: '-101010'
Explanation: Negative sign is preserved, 42 in binary is 101010
Apex Code Editor
Welcome to Lightning Challenge!
Create an Account
Sign up to track your progress, earn points, and compete with others. Your solutions will be saved automatically.
Create accountHow 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 Mar/April 2026
Contest runs March 3 - April 30. Complete challenges to climb the leaderboard!
Points are calculated for challenges completed during the contest period.