Upper case conversion Java

PROGRAM TO CONVERT LOWER CASE CHARACTERS TO UPPER CASE CHARACTERS



class Main
{
  
    // Converts a string to uppercase
    static String to_upper(char[] in)
    {
        for (int i = 0; i < in.length; i++) 
        {
            if ('a' <= in[i] & in[i] <= 'z')
            {
                in[i] = (char) (in[i] - 'a' + 'A');
            }
        }
        return String.valueOf(in);
    }
  
    // Driver code
    public static void main(String[] args) 
    {
        String str = "geeksforgeeks";
        System.out.println(to_upper(str.toCharArray()));
    }
} 

OUTPUT
GEEKSFORGEEKS

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