/* Example   on  counting loop and for statement.           file: 3ex2.cpp

   FALL 1998
   ___________________________________
   Jacob Y. Kazakia   jyk0
   September 16, 1998
   ___________________________________

 Purpose: This program determines the positions where a given number
          of wooden posts are to be placed.  The location of the beginning point
          and the location of the end point are read through the keyboard.
          The beginning and end points are marked by concrete minitowers
          The number of the posts to be placed on a straight line in between
          these two points is also read through the keyboard.  The posts are
          placed at equal intervals.  The location of each post is calculated
          and outputted to the screen.

   Algorithm: The location of the beginning point and the end point are given
              using coordinates  xstart   and  xend in reference to a line
              connecting the two points with origin at a fixed point on this
              line.
              In order to simplify things we will require that xend > xstart.
              All coordinates will be given in feet.
              The distance between the start and the end is

                   distance = xend - xstart

              If the number of posts to be placed in between is postnumber then
              the distance  d1 between two consecutive posts will be

                  d1 = distance / ( postnumber + 1  )

              The location of the first post will be  xstart + d1
              the location of the second post will be xstart + 2 * d1
                           of the third               xstart + 3 * d1
                           etc.
                                                                            */
#include <iostream.h>

main()
{
float xstart;   // x coordinate of the starting minitower
float xend;     // corresponding coordinate of the end minitower
float distance; // the distance between start and end
float d1;       // the distance between two consecutive posts
float location; // the location of the current post

int postnumber; // the number of wooden posts to be placed at equal
                // intervals between the two minitowers on a straight line.

int k;          // a running index indicating the current post

cout<<" \n  Enter the coordinates xstart and xend ( in feet)."<<endl;
cout<<"  Leave a space in between and make sure xend > xstart"<< endl;

cin >> xstart>>xend;

if( xstart > xend)
 cout<<" You entered the coordinates incorrectly" ;
else
 {
  cout<<" enter the number of wooden posts you need .....";
  cin >> postnumber;

  distance = xend - xstart;
  d1 = distance / (postnumber + 1 );
  cout<<"  \n The start is located at " << xstart <<" feet"<< endl;
  for ( k = 1 ; k <= postnumber ; k++ )
    {
      location = xstart + (float)k * d1 ;
      cout<<" The post # "<< k << "    is at  " << location <<" feet"<< endl ;
    }
  cout<<"  \n The end is located at " << xend << " feet "<< endl;

  }

cout<<"  \n\n  Enter e (exit) to terminate  ....";
char hold;
cin>>hold;
}  

/*    THE OUTPUT:


  Enter the coordinates xstart and xend ( in feet).
  Leave a space in between and make sure xend > xstart
4.5  8.98
 enter the number of wooden posts you need .....9

 The start is located at 4.5 feet
 The post # 1    is at  4.948 feet
 The post # 2    is at  5.396 feet
 The post # 3    is at  5.844 feet
 The post # 4    is at  6.292 feet
 The post # 5    is at  6.74 feet
 The post # 6    is at  7.188 feet
 The post # 7    is at  7.636 feet
 The post # 8    is at  8.084 feet
 The post # 9    is at  8.532 feet

 The end is located at 8.98 feet


  Enter e (exit) to terminate  ....



*/