Java

//Convert the given string into UPPERCASE in Java

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

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

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