/*
 *  =============================================================
 *  WindForce.java: Compute and print force due to gusts of wind.
 *
 *  Written By: Mark Austin                         November 2005
 *  =============================================================
 */

import java.lang.Math;
import java.text.*;

public class WindForce {

   // main method : this is where the program execution begins.

   public static void main ( String [] args ) {
       double dT, dTime;

       // Print windforce heading

       System.out.println("     Time      Force");
       System.out.println("(seconds)       (kN)");
       System.out.println("====================");

       // Compute and print wind force 

       for ( dTime = 0.0; dTime <= 3.0; dTime = dTime + 0.25 ) { 
             System.out.printf("   %6.2f   %7.2f\n",
                    dTime, windForce ( dTime - Math.floor( dTime ) ) );
       }
   }

   // Method that computes the wind force.

   static double windForce( double dT ) {
        double dWindForce;

        if (dT <= 0.3 ) 
            dWindForce = (4.0 + 15.0*dT - 135.0*Math.pow(dT, 3.0));
        else
            dWindForce = ((731.0 - 171*dT)/140.0);

        return dWindForce;
   }
}