Java

//Convert the given string into lowercase in Java

public class App {
    public static void main(String[] args) {
        // Program to Convert string to LowerCase
        StringBuilder a = new StringBuilder("ABCD");
        System.out.println("Original Input : " + a);

        for (int i = 0; i < a.length(); i++)// 97-122
        {
            if (a.charAt(i) >= 65 && a.charAt(i) <= 90) {
                int c = (int) a.charAt(i) + 32;// 65+32=97 66+32=98 67+32=99 68+32=100
                a.setCharAt(i, (char) c);// abcd
            }
        }

        System.out.println("Lowercase Output: " + a);
    }
}