/*
 * =====================================================================================
 *
 *       Filename:  sm2_tab.c
 *
 *    Description:  Srodek masy. Punkt materialny reprezentowany tablicami 4 elementowymi. 
 *
 *        Version:  1.0
 *        Created:  12.11.2013 23:44:44
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Marek Grochowski (2013), 
 *   Organization:  KIS
 *
 * =====================================================================================
 */
#include <stdio.h>

void srodek(float p1[], float p2[], float sm[])
{
    int i=0;
    sm[3]=p1[3]+p2[3];
    while(i<3) 
    {
         sm[i]=(p1[3]*p1[i]+p2[3]*p2[i])/sm[3];
         i = i + 1;
    }
}

void wczytaj(float p[])
{
   printf("Podaj wsp. x,y,z i mase: ");
   scanf("%f %f %f %f",&p[0],&p[1],&p[2],&p[3]);
}

void wypisz(float p[])
{
   printf("x=%f y=%f z=%f m=%f\n",p[0],p[1],p[2],p[3]);
}

void kopia(float p1[],float p2[])
{
    int i=0;
    while(i<4)
    {
       p2[i]=p1[i];
       i = i + 1;
    }

}

int main()
{
    float p1[4], p2[4] , p[4]; 
    char dalej='t';
    int i=1;

    p[0] = 0.0;  p[1] = 0.0;  p[2] = 0.0;  p[3] = 0.0;

    do
    {
      kopia(p,p2);
      printf("Punkt %d\n",i);
      wczytaj(p1);
      srodek(p1,p2,p);
      printf("Aktualny srodek masy:\n");
      wypisz(p);
      printf("Czy dodac kolejny punkt [t/n] ? ");
      scanf(" %c",&dalej);
      i = i + 1;
    }while(dalej != 'n' );

   printf("Srodek masy:\n");
   wypisz(p);

   return 0;
}