//readin.c  --- fopen/fgets --- copyLeft by tsaiwn@csie.nctu.edu.tw
#include <stdio.h>
#include <stdlib.h>
char FNAME[ ] = "abc.txt";
int main( ) {
   FILE* fp;
   static char buf[99];
   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);
   while( !feof(fp) ) {
       ++n;  x = atof(buf);
       ans += x;
       printf("%f ", x);
       fgets(buf, sizeof(buf), fp);
   }
   printf("\nTotal %d items. Sum = %f\n", n, ans);
   return 0;
}