Model de citire struct-uri din fisier cu functii separate

#include <stdio.h>
#include <stdlib.h>

struct interval
{
    int start, finish;
};

void citire(FILE *fin,int *n, struct interval *ptr)
{
    fscanf(fin,"%d",&(*n));
    int i;

    for (i=0; i<*n; i++)
    {
        fscanf(fin,"%d %d",&ptr->start,&ptr->finish);
        ptr++;
    }

}

void afisare(FILE *fout, int n, struct interval *ptr)
{
    int i;

    fprintf(fout,"%d\n",n);

    for (i=0; i<n; i++)
    {
        fprintf(fout,"%d %d\n", ptr->start, ptr->finish);
        ptr++;
    }

}

int main()
{
    FILE *fin, *fout;

    fin = fopen("date.in","r");
    fout = fopen("date.out","w");

    struct interval vec[100];
    int n;

    citire(fin,&n,vec);

    afisare(fout,n,vec);

    printf("%d",n);
    printf("\n%d %d",vec[0].start,vec[0].finish);

    return 0;
}

// model de pe net

#include <stdio.h>

// student structure
struct student {
  char id[15];
  char firstname[64];
  char lastname[64];
  float points;
};

// function declaration
void getDetail(struct student *);
void displayDetail(struct student *);

int main(void) {

  // student structure variable
  struct student std[3];

  // get student detail
  getDetail(std);

  // display student detail
  displayDetail(std);

  return 0;
}

// function definition


void getDetail(struct student *ptr) {

  int i;

  for (i = 0; i < 3; i++) {
    printf("Enter detail of student #%d\n", (i + 1));
    printf("Enter ID: ");
    scanf("%s", ptr->id);
    printf("Enter first name: ");
    scanf("%s", ptr->firstname);
    printf("Enter last name: ");
    scanf("%s", ptr->lastname);
    printf("Enter Points: ");
    scanf("%f", &ptr->points);

    // update pointer to point at next element
    // of the array std
    ptr++;
  }

}

void displayDetail(struct student *ptr) {

  int i;

  for (i = 0; i < 3; i++) {
    printf("\nDetail of student #%d\n", (i + 1));

    // display result via ptr variable
    printf("\nResult via ptr\n");
    printf("ID: %s\n", ptr->id);
    printf("First Name: %s\n", ptr->firstname);
    printf("Last Name: %s\n", ptr->lastname);
    printf("Points: %f\n", ptr->points);

    // update pointer to point at next element
    // of the array std
    ptr++;
  }

}