#include <stdio.h>
#define MAX_LENGTH 256


main()
{
  int i;
  char error=0;
  char count;
  int num=0, lnum=0;
  char str[MAX_LENGTH];
  char ch;
  FILE *fpi, *fpo;
  double a, b, c, d, e, f;
  double sum=0;

  fpi=fopen("depth1", "r");

  while(1){
    for(i=0; i<MAX_LENGTH; i++){
      if(fscanf(fpi, "%c", &ch)!=1){
	error=1;
	break;
      }
      str[i]=ch;
      if(ch=='\n') break;
    }
    if(i==MAX_LENGTH) printf("Warning: out of buffer size\n");
    str[i]=0;
    num++;
    count=sscanf(str, "%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f);
    if(count!=5)
      printf("Line %i not included: number of lines %i must be 5\n", num, count);
    else printf("g =%g\n", e), lnum++, sum+=e;
    if(error) break;
  }

  fclose(fpi);

  printf("av(g)=%g, Number of values used is %i\n", sum/lnum, lnum);
}