/**
  * 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 TraceFunction
  implements RealFunction
{
  private
  RealFunction f;

  public
  TraceFunction(RealFunction f) {
    this.f = f;
  }

  public
  double at(double x) {
    double y = f.at(x);

    System.out.println(
      f + " at " + x +"\t= " + y);

    return
      y;
  }

  public
  String toString() {
    return
      f.toString();
  }
}