Problem
Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.
Example 1:
Input: "Hello"
Output: "hello"Example 2:Input: "here"
Output: "here"Example 3:Input: "LOVELY"
Output: "lovely"Solution
class Solution { public String toLowerCase(String str) { char[] chs = str.toCharArray(); for (int i = 0; i < chs.length; i++) { char ch = chs[i]; if ((int)ch >= 65 && (int)ch <= 90) chs[i] += 32; } return new String(chs); }}//a: 97, z: 122//A: 65, Z: 90