Проблема с выводом файла и с присваиванием значения

#include <iostream>
#include <stdio.h>
using namespace std;
 
int main()
{
FILE *f;
f=fopen("1.txt","w");
cout<<"\nVvod file:";
int i,b;
for (i=0;i<9;i++)
{
cout<<"\nVvod "<<i<<"-go komponenta ";
cin>>b;
fwrite(&b,sizeof(b),1,f);
}
fclose(f);
f=fopen("1.txt","r");
float max=0,min=99999999;
while (fread(&b,sizeof(b),1,f))
{
if (b < min)
min=b;
{
if (b > max)
max=b;
}
}
cout << "\nmax=" << max;
cout << "\nmin=" << min;
}

#include <cstdlib>
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <iterator>
using namespace std;
 
template <typename T> vector <T> read(const char* fname) {
 vector <T> v;
 ifstream f(fname, ios::binary);
 if (!f) {
  cout << "Can't open " << fname << " to read data"; exit(2);
 }
 T val;
 while (!f.read((char*)&val, sizeof(T)).eof()) {
  v.push_back (val);
 }
 f.close();
 return v;
}
 
int main() {
 const int n = 10;
 vector <int> v;
 
 int val;
 cout << endl;
 for (size_t i = 0; i < n; i++) {
  do {
   cout << "Type item " << (i+1) << ": ";
   cin >> val;
   if (cin.good()) break;
   cin.clear();
   cin.ignore(INT_MAX, '\n');
  } while (1);
  v.push_back (val);
 }
 
 ofstream f("1.dat", ios::binary);
 if (!f) {
  cout << "Can't open 1.dat to write"; exit(1);
 }
 f.write((char*)&v[0], v.size() * sizeof(int));
 f.close();
 
 v.clear();
 v = read <int> ("1.dat");
 cout << endl << "Read source file: ";
 copy(v.begin(), v.end(), ostream_iterator <int>(cout, " "));
 
 int sum = *min_element(v.begin(), v.end()) + *max_element(v.begin(), v.end());
 cout << endl << "Sum=" << sum;
 
 fstream f2("1.dat", ios::binary | ios::in | ios::out);
 f2.seekp(0, ios_base::beg);
 f2.write((char*)&sum, sizeof(int));
 f2.seekp((v.size()-2)* sizeof(int), ios_base::beg);
 f2.write((char*)&sum, sizeof(int));
 f2.close();
 
 v.clear();
 v = read <int>("1.dat");
 cout << endl << "Read changed file: ";
 copy(v.begin(), v.end(), ostream_iterator <int>(cout, " "));
 
    return 0;
}