/*------------------------------------------------------------*/
/*  Program chapter7_6                                        */
/*                                                            */
/*  This program reads tsunami information from a data        */
/*  file and then prints the maximum wave height, the average */
/*  wave height, and the location of all tsunamis with        */
/*  greater-than-average wave heights.                        */

#include <stdio.h>
#define FILENAME "waves2.txt"

/*  Define structure to represent a tsunami.  */
struct tsunami
{
   int mo, da, yr, fatalities;
   double max_height;
   char location[20];
};

int main(void)
{
   /*  Declare variables.  */
   int k=0, npts;
   double max=0, sum=0, ave;
   struct tsunami t[100];
   FILE *waves;

   /*  Read and print information from the file.  */
   waves = fopen(FILENAME,"r");
   if (waves == NULL)
      printf("Error opening data file. \n");
   else
   {
      while (fscanf(waves,"%d %d %d %d %lf %s",&t[k].mo,&t[k].da,
                    &t[k].yr,&t[k].fatalities,&t[k].max_height,
                    t[k].location) == 6)
      {
         sum = sum + t[k].max_height;
         if (t[k].max_height > max)
            max = t[k].max_height;
         k++;
      }
      npts = k;
      ave = sum/npts;	  
      printf("Summary Information for Tsunamis \n");
      printf("Maximum Wave Height (in feet): %.2f \n",max*3.28);
      printf("Average Wave Height (in feet): %.2f \n",ave*3.28);
      printf("Tsunamis with greater than average heights: \n");
      for (k=0; k<=npts-1; k++)
         if (t[k].max_height > ave)
            printf("%s \n",t[k].location);
      fclose(waves);
   }

   /*  Exit program.  */
   return 0;
}
/*-------------------------------------------------------------*/