//readin.c  --- fopen/fgets --- copyLeft by tsaiwn@csie.nctu.edu.tw
#include <stdio.h>
#include <stdlib.h>
char FNAME[ ] = "abc.txt";
char*p; int len;
int main( ) {
   FILE* fp;
   static char buf[9];
   double ans, x;
   int n;
   fp = fopen(FNAME, "rt");    // open for read, text file
   if(fp == 0) {
       fprintf(stderr, "open file %s ", FNAME);
       perror("Error ");
       return 38;
   }
   ans = n = 0;
   //fgets(buf, sizeof(buf), fp); fpurge(fp);
   p = fgetln(fp, &len);
   printf(" len=%d\n", len);
   while( !feof(fp) ) {
       ++n;  x = atof(p);
       ans += x;
       printf("%f ", x);
       //fgets(buf, sizeof(buf), fp);
       p = fgetln(fp, &len);
   }
   printf("\nTotal %d items. Sum = %f\n", n, ans);
   return 0;
}