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Full Discussion: Correct way to read data of different formats into same struct
Top Forums Programming Correct way to read data of different formats into same struct Post 302940450 by Don Cragun on Monday 6th of April 2015 01:46:17 AM
Old 04-06-2015
I guess I don't see your problem.

Changing your program slightly so it will compile, read from standard input instead of from a hardcoded filename, and not overwrite memory following your array if you overflow the array:
Code:
#include <stdio.h>

#define	NMAX	7

typedef struct info
{
  char name[20];
  double test;
  double quiz;
  double English;
} Info;

int main()
{
  int	n = 0;
  int	ret;
  Info	record[NMAX];

  while (n < NMAX && (ret = fscanf (stdin, "%s %lf %lf %lf", 
               record[n].name, &record[n].test,
               &record[n].quiz, &record[n].English)) == 4)
    {
      printf ("%s\t%.2lf\t%.2lf\t%.2lf\n", 
              record[n].name, record[n].test,
              record[n].quiz, record[n].English);
      ++n;
    }
  printf("%d records processed.\n", n);
  printf("return code from last fscanf() call: %d\n", ret);

  return 0;
}

and running it in a directory containing format1.dat and format2.dat from post #1 in this thread as follows:
Code:
$ ./a.out < *1.dat
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
Zena	323.00	215.45	332.50
4 records processed.
return code from last fscanf() call: -1
$ ./a.out < *2.dat
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
Zena	323.00	215.45	332.50
Mira	285.00	285.00	415.00
5 records processed.
return code from last fscanf() call: -1
$ cat *.dat | ./a.out
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
Zena	323.00	215.45	332.50
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
7 records processed.
return code from last fscanf() call: 4

This User Gave Thanks to Don Cragun For This Post:
yifangt
 

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