#include <stdio.h>
 
void show_avg(int tab[],size_t size)
  {
   int pos,val;
   struct { const char *name;  size_t count; double sum; } tb[2]={{"ujemnych"},{"dodatnich"}};
   while(size--)
     {
      val=tab[size];
      pos=(val>=0);
      ++tb[pos].count;
      tb[pos].sum+=val;
     }
   for(pos=0;pos<2;++pos) printf("srednia %s wynosi: %.2lf\n",tb[pos].name,tb[pos].count?tb[pos].sum/tb[pos].count:0);
   return 0;
  }
 
int main()
  {
   int tab[]={ -3, -2, -1, 1, 2, 3, 4 };
   show_avg(tab,sizeof(tab)/sizeof(*tab));
   return 0;
  }

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