15. Gravity Program Skeleton



Answer:
  • What kind of loop will be used? A counting loop, since t will increase until it hits a limit.
  • What is the loop control variable? Time, t, since it is increased, second by second.
  • What does the loop body do? It calculates distance for the current value of t , then increases t.






Gravity Program Skeleton
The program looks like this:




    

        
            

            

            

                
                    
import java.util.Scanner;

// User picks ending value for time, t.
// The program calculates and prints 
// the distance the brick has fallen for each t.
//
public class FallingBrick
{
  public static void main (String[] args ) 
  {
    final  double G = 9.80665;  // constant of gravitational acceleration
    int    t, limit;            // time in seconds; ending value of time
    double distance;            // the distance the brick has fallen
    Scanner scan = new Scanner( System.in );

    // Get the number of seconds
    System.out.print( "Enter limit value: " );
    limit = scan.nextInt();

    // Print a table heading
    System.out.println( "seconds\tDistance"  );  // '\t' is tab
    System.out.println( "-------\t--------"  ); 

    t =  ;
    
    // calculate the distance for each second
    while (  )    
    {
      (more statements will go here later.)

      t = 
    }

  }
}        

                		
            

        
    

    







Question 15:
First get the loop correct. Three things must be coordinated: Time starts at zero, increases by one second each iteration, and when time equals limit the last value is printed out.