sort.cpp

struct Int {
  int i;
  Int(int a=0) { i = a; }
  void write(ofstream&);
  void read(ifstream&);
};

void sort() {
  ifstream fin("ints.dat");
  ofstream fout("temp.dat");
  Int temp, *ptr; // this can be an array

  //shove it int an array
  int i = 0;
  while(fin.read((char*)temp, sizeof(Int))) {
    ptr[i++] = temp;
  }

  //sort the array
  for(int j=0; j<i-1; j++) {
    for(int k=0; k<i-1-j; k++) {
      if(ptr[k].i > ptr[k+1].i) {
        Int temp = ptr[k];
        ptr[k] = ptr[k+1];
        ptr[k+1] = ptr[k];
      }
    }
  }

  //shove it into the new file
  for(j=0; j<i; j++) {
    fout.write((char*)temp, sizeof(Int))
  }

  remove("ints.dat");
  rename("temp.dat", "ints.dat");
}