Read Text File into Nested Structure

[acacia314]

I'm attempting to read a data file into a array of structures. The data comes like this

Jane Doe 5 245-44-8899 September 15, 2005

Number of entries in the file is unknown.


My segment to read the file is as follows:

while( (fscanf(inf, "%s %s %d %s %s %d, %d", arr[numRead].fName, arr[numRead].lName, arr[numRead].gradeLvl, month, arr[numRead].date.day,
arr[numRead].date.year)) == 7)
    {
      numRead++;
    }
 
and this is the structure declaration:
 
typedef struct
   {
    int month;
    int day;  
    int year;
   } DATE;
 
typedef struct
   {
    char fName[STR_SIZE];
    char lName[STR_SIZE];
    int gradeLvl;
    char social[SS_SIZE];
    DATE date;
   }STUREC;
 

The month string is in the because i have to convert text month into numerical month cuz its stored as an int in my structure.

If more of the code is needed please send a PM but i think the problem is in the posted segment.

[acacia314]

O and the problem is that its not even going into the loop once. If i remove the loop it still won't store the info into the array so I assume its a problem with the fscanf

[AdrianH]

I'm attempting to read a data file into a array of structures. The data comes like this

Jane Doe 5 245-44-8899 September 15, 2005

Number of entries in the file is unknown.


My segment to read the file is as follows:

while( (fscanf(inf, "%s %s %d %s %s %d, %d", arr[numRead].fName, arr[numRead].lName, arr[numRead].gradeLvl, month, arr[numRead].date.day,
arr[numRead].date.year)) == 7)
...
 

The scanf set of functions (including fscanf) require that you pass pointers to where you want to store the data. arr[numRead].fName will be auto converted to a pointer since it is an array. arr[numRead].gradeLvl is an int so it will not be converted. If you pass anything but pointers, what will occurr is undefined. If you are lucky, it will seg fault, giving you an indication that something is wrong.

The month string is in the because i have to convert text month into numerical month cuz its stored as an int in my structure.

That is fine.

If more of the code is needed please send a PM but i think the problem is in the posted segment.

You also have a problem with the number of parameters you are passing. Excluding the file handle and the format string, your format string states 7, your equality states 7, but the number of parameters you actually pass are 6. Another reason for it to do random things.

Further, you should also set limits in the %s format to keep it from overrunning the char array boundary. This may be beyond the scope of your assignment however, so unless you ask for me to explain further, I won’t go into detail.

Hope this helps.


Adrian

[acacia314]

Much appreciated, needed some clarification on pointers with the structures. Added the SS input (7th param) in the scan and fixed the pointers.

Thanks!