#include <stdio.h>
#include <string.h>
#include <math.h>
#include <conio.h>

const int NAMELEN=30;
const int MAXCLASSSIZE=10;

typedef struct StudentRec {
    char lastname[NAMELEN];
    char firstname[NAMELEN];
    long int ID;
    int finalmark;
}Student;

typedef struct ClassRec {
    int size;
    Student classlist[MAXCLASSSIZE];
}Class;

void ReadStudents (Class *classpar, FILE *stuFile);
void PrintStuRec (Student *studpar);
void PrintStudents (Class *classpar);

void main() {
    FILE *inputPtr;
    Class clist;
    inputPtr=fopen("student.dat","r");
    if(inputPtr==NULL)
        printf("Error openning input file. \n");
    else {
        ReadStudents(&clist,inputPtr);
        PrintStudents(&clist);
        }

    getch();
} /*end main */

    void ReadStudents (Class *classpar, FILE *studFile)
    {
        int i;
        long int idnumber;
        char fname[NAMELEN];
        char lname[NAMELEN];
        int mark;
        i=0;

        while(studFile != NULL) {
            scanf("%li %s %s %i", &idnumber, fname, lname, &mark);
            classpar->classlist[i].ID = idnumber;
            strcpy(classpar->classlist[i].firstname,fname);
            strcpy(classpar->classlist[i].lastname,lname);
            classpar->classlist[i].finalmark = mark;
            i++;
        }

    } /* end function read */

    void PrintStuRec (Student *stupar)
    {
        printf("%-10li %-8s %-8s %2i\n", stupar->ID, stupar->firstname, stupar->lastname, stupar->finalmark);
    } /* end function */

    void PrintStudents (Class *classpar)
    {
        int i;
        i=0;
        while(classpar != NULL); {
            PrintStuRec(classpar->classlist[i]);
            i++;
        }
    }