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

Subtract.java

package com.ssaurel.countdowngame;

public class Subtract implements Operation {

  @Override
  public int eval(int x, int y) {
    if (x < y) {
      return y - x;
    } else {
      return x - y;
    }
  }

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

}