709. To Lower Case

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LeetCode

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Problem

Given a string s, return the string after replacing every uppercase letter with the same lowercase letter.

Example 1:

Input: s = "Hello"
Output: "hello"

Example 2:

Input: s = "here"
Output: "here"

Example 3:

Input: s = "LOVELY"
Output: "lovely"

Constraints:

• $1 <= s.length <= 100$
• s consists of printable ASCII characters.

Code

class Solution {
    public String toLowerCase(String s) {
        char[] arr = s.toCharArray();
        for(int i = 0; i < arr.length; i++) {
            char curr = arr[i];
            if('A' <= curr && curr <= 'Z') {
                arr[i] = (char)(arr[i] - 'A' + 'a');
            }
        }

        return new String(arr);
    }
}