code
package javahomework; import javax.swing.JOptionPane; public class HW04 { public static void main(String args[]) { int input; input = Integer.parseInt(JOptionPane.showInputDialog(null,"Input Number")); JOptionPane.showMessageDialog(null,"The sum of "+input+" is "+ADD(input)); } static int ADD(int n) { if (n<10) return n; else return (ADD(n/10)+ADD(n%10)); } }
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