/*
*   File Name   :   straight-line_distance.c
*	Title       :   Straight-line Distance Calculation Program
*	Author      :   Buff Furman
*	Lab Section :   day
*	Assignment  :   Lab_1
*	Created     :   18AUG2009
*	Revised     :   18AUG2009
*	Version     :   1.0
*	Description :   Calculates the straight-line distance between two points
*	Inputs	    :   x and y ordered pairs for two points: x1, y1 and x2, y2
*	Outputs	    :   straight-line distance between the two points
*	Method	    :   Get points from the user
*                   Echo what was entered to the monitor
*                   Calculate the distance, D=sqrt((x2-x1)^2 + (y2-y1)^2)
*                   Display D to the monitor
                  

*	Revision History:
*	Date		Who			Description of Change
*	-------		---------	---------------------------
*	18AUG2009	BF			Created program

*/

/*---------Include Files--------------*/

#include <stdio.h>			/* standard IO library routines, like printf(), scanf() */
#include <math.h>           /* standard math library routines, like sqrt() */

/*---------Macros---------------------*/

                            /* none in this program */


/*---------Function Prototypes--------*/

                            /* none in this program */


/*---------Global Variables-----------*/

                            /* none in this program */
					

/*---------Body of Program Code-------*/

int main(void)
{
				
    double X1, X2, Y1, Y2;	    	/* variables for the xy coordinates of P1 and P2 */
    double D;                       /* distance between P1 and P2 */


    /* Get the points from the user */
    printf("\nEnter the first point, P1, in the form, x1 y1> ");
    scanf("%lf %lf", &X1, &Y1);
    printf("  You entered: P1 = (%g, %g)\n", X1, Y1);
    
    printf("\nEnter the second point, P2, in the form, x2 y2> ");
    scanf("%lf %lf", &X2, &Y2);
    printf("  You entered: P2 = (%g, %g)\n", X2, Y2);
    
    /* Calculate the straight-line distance between P1 and P2 */
    D = sqrt(pow((X2-X1),2) + pow((Y2-Y1),2));
    
    /* Display the distance */
    printf("\nThe straight-line distance between P1 and P2 is %.4f \n\n", D);
    	
return 0;		
}


/*---------Function Definitions-------*/

                            /* none in this program */