/* include the standard I/O function prototypes */
#include <stdio.h>

		/* define a 3D point structure */
struct 
Point3D_s
{
	double x, y, z;
};

int
main()
{
		/* declare and initialize two 3D points */
	struct Point3D_s p = { 1.0, 2.0, 3.0 },
	                 q = { 1.0, 1.0, 1.0 };
		/* add q to p */
	p.x += q.x;		/* refer to elements of structure */
	p.y += q.y;
	p.z += q.z;

	printf( "x = %f, y = %f, z = %f \n", p.x, p.y, p.z );
	
	return 0;
}