ejercicio uno

   import java.io.*;
   public class digitos{
      public static void main(String args[])throws IOException{
         BufferedReader in=new BufferedReader(new InputStreamReader (System.in));
         int n,ninv=0,a;

         System.out.print("ingrese numero: ");
         n= Integer.parseInt(in.readLine());

         do{
            a= (n%10);
            n=n/10;
            ninv = ninv*10+a;
         }
         while (n>0);
         System.out.println("el numero en orden inverso es :  " +ninv);
      }
   }