Add Operation for the Countdown Math Game on the SSaurel's Channel

Add.java

package com.ssaurel.countdowngame;

public class Add implements Operation {

  @Override
  public int eval(int x, int y) {
    int r = x + y;

    if (r <= x  ||  r <= y) {
      return 0;
    } else {
      return r;
    }
  }

  @Override
  public String symbol() {
    return "+";
  }

}