package username.analysis;

import java.io.PrintWriter;
import java.math.BigDecimal;

/**
 * A class that helps analyze the various exponentiation algorithms.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of April 2006
 */
public class AnalyzeExpt
{
  // +-----------+-----------------------------------------------
  // | Constants |
  // +-----------+

  /**
   * The number of times to repeat a tests so that too-quick tests
   * aren't too fast too measure.
   */
  private static final double REPETITIONS = 1000.0;


  // +-------+---------------------------------------------------
  // | Tests |
  // +-------+

  public static void main(String[] args)
    throws Exception
  {
    BigDecimal x;
    PrintWriter pen = new PrintWriter(System.out, true);
    Analyst eryn = new Analyst();
    Mathematician emily = new Mathematician(eryn);
    // Try a variety of exponents
    for (int n = 0; n < 1000; n = n*2+1) {
      // Try a variety of bases
      for (int i = 0; i <= 6; i++) {
        x = new BigDecimal(((double) i) / 2);
        eryn.reset();
        for (int rep = 0; rep < REPETITIONS; rep++) {
          BigDecimal result = emily.exptFor(x,n);
        } // for
        eryn.stop();
        pen.println("x: " + x 
                    + "\tn: " + n
                    + "\tsteps: " + eryn.steps()/REPETITIONS
                    + "\ttime: " + eryn.elapsed()/REPETITIONS
                   );
      } // for each base
    } // for each exponent
  } // main(String[])

} // class AnalyzeExpt