/**
  * Copyright (c): Uwe Schmidt, FH Wedel
  *
  * You may study, modify and distribute this source code
  * FOR NON-COMMERCIAL PURPOSES ONLY.
  * This copyright message has to remain unchanged.
  *
  * Note that this document is provided 'as is',
  * WITHOUT WARRANTY of any kind either expressed or implied.
  */

public
class AddFunctions
  implements RealFunction
{
  private
  RealFunction f1;

  private
  RealFunction f2;

  public
  AddFunctions(RealFunction f1, RealFunction f2) {
    this.f1 = f1;
    this.f2 = f2;
  }

  public
  double at(double x) {
    return
      f1.at(x) + f2.at(x);
  }

  public
  String toString() {
    return
      "(" + f1.toString() + " + " + f2.toString() + ")";
  }
}