/** InputExample - demonstrate interpreting numeric values from

 ** input from console (System.in)

 **/



import java.io.IOException;



public class InputExample {



  public static void main( String[] args) {

    InputExample example = new InputExample();



    System.out.print("enter int values, end with end of file character:");

    System.out.flush();

    

    int sum = example.sumIntValues();

    System.out.println("Sum is " + sum);

  }



  public int sumIntValues() {

    byte input[] = new byte[80];

    int bytesRead ;

    String inputString = null;

    String trimmedString = null;

    int intValue = 0;

    int sum = 0;



    try {

      while (true) {

        // Read input bytes and create a String object from them

        bytesRead = System.in.read(input);

        if (bytesRead < 0)   // read returns -1 of no more is available

          break;



        inputString = new String(input, 0, bytesRead);



        // Remove any whitespace from either end

        trimmedString = inputString.trim();



        // After removing whitespace check if the string has zero length

        if (trimmedString.length() == 0)

          continue;                     // try again



        // Try to convert what is left to an integer value

        // Note that this doesn't check for non-digits



        intValue = Integer.parseInt(trimmedString);

        sum += intValue;

      }

    }

    catch (IOException e) {

      System.out.println("whoops, caught IO Exception");

    }

    return sum;

  }

}