С++ Збереження та читання структури fwrite/fread

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>

using namespace std;

struct Worker
{
  short id;
  int age;
  double salary;
};

int main()
{
  Worker* p1 = new Worker[100];
  Worker* p2 = new Worker[100];

  p1[0].id = 1;
  p1[0].age = 20;
  p1[0].salary = 1200;

  p1[1].id = 2;
  p1[1].age = 32;
  p1[1].salary = 1320;

  // Запис
  FILE* outfile;
  outfile = fopen("1.txt", "w");
  if (outfile == NULL)
  {
    cout << "File error" << endl;
    return 1;
  }
  fwrite(p1, sizeof(struct Worker), 2, outfile);  // 2 елементи
  fclose(outfile);

  // Читання
  FILE* infile;
  infile = fopen("1.txt", "r");
  if (infile == NULL)
  {
    cout << "File error" << endl;
    return 1;
  }
  int n = 0;
  while (fread(&p2[n], sizeof(struct Worker), 1, infile))
  {
    n++;
  }
  cout << "Elements: " << n << endl << endl;
  fclose(infile);

  for (int i = 0; i < n; i++)
  {
    cout << p2[i].id << endl;
    cout << p2[i].age << endl;
    cout << p2[i].salary << endl;
    cout << endl;
  }

  system("pause");
  return 0;
}

 

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Додаткова структура як БД

struct DB
{
  int size;
  Worker w[100];
};

DB t;
fwrite(&t, sizeof(t), 1, outfile);
fread(&t, sizeof(t), 1, infile);