Use exceptions to watch for and handle I/O errors.

#include <iostream>#include <fstream>#include <cstring>using namespace std;struct inventory {  char item[20];  int quantity;  double cost;};int main(){  int completion_status = 0;  ofstream fout;  fout.exceptions(ios::failbit | ios::badbit);  try {    fout.open("InvDat.dat", ios::out | ios::binary);  } catch(ios_base::failure exc) {    cout << "Cannot open file.\n";    cout << "String returned by what(): " << exc.what() << endl;    return 1;  }  inventory inv[3];  strcpy(inv[0].item,"A");  inv[0].quantity = 1;  inv[0].cost = 9.9;  strcpy(inv[1].item, "B");  inv[1].quantity = 2;  inv[1].cost = 7.5;  strcpy(inv[2].item, "C");  inv[2].quantity = 19;  inv[2].cost = 2.75;  try {    for(int i=0; i<3; i++)      fout.write((const char *) &inv[i], sizeof(inventory));  } catch(ios_base::failure exc) {    cout << exc.what() << endl;    completion_status = 1;  }  try {    fout.close();  } catch(ios_base::failure exc) {    cout << exc.what() << endl;    completion_status = 1;  }  return completion_status;}