// Karl Ramberg
  2 // 2-17-19
  3 // CS181 - Assignment 1 - Q4
  4
  5 #include<iostream>
  6 #include<fstream>
  7
  8 using namespace std;
  9
 10 struct Division
 11 {
 12     string name;
 13     int id;
 14     double sales;
 15     int year;
 16 };
 17
 18 void openFile(string &filename, fstream &file);
 19
 20 void readFile(string filename, fstream &file);
 21
 22 void writeFile(string filename, fstream &file);
 23
 24 void modifyFile(string filename, fstream &file);
 25
 26 int main()
 27 {
 28     fstream file;
 29     string filename;
 30     openFile(filename, file);
 31
 32     int choice;
 33     cout << "(1) Read, (2) Write, or (3) Modify? ";
 34     cin >> choice;
 35
 36     while(choice != 1 && choice != 2 && choice != 3)
 37     {
 38         cout << "Not a valid operation" << endl;
 39         cout << "(1) Read, (2) Write, or (3) Modify? ";
 40         cin >> choice;
 41     }
 42
 43     if(choice == 1)
 44     {
 45         readFile(filename, file);
 46     }
 47      else if(choice == 2)
 48     {
 49         writeFile(filename, file);
 50     }
 51     else
 52     {
 53         modifyFile(filename, file);
 54     }
 55 }
 56
 57 void openFile(string &filename, fstream &file)
 58 {
 59     cout << "Choose a file: ";
 60     cin >> filename;
 61
 62     file.open(filename, ios::in | ios::out | ios::binary);
 11 {
 12     string name;
 13     int id;
 14     double sales;
 15     int year;
 16 };
 17
 18 void openFile(string &filename, fstream &file);
 19
 20 void readFile(string filename, fstream &file);
 21
 22 void writeFile(string filename, fstream &file);
 23
 24 void modifyFile(string filename, fstream &file);
 25
 26 int main()
 27 {
 28     fstream file;
 29     string filename;
 30     openFile(filename, file);
 31
 32     int choice;
 33     cout << "(1) Read, (2) Write, or (3) Modify? ";
 34     cin >> choice;
 35
 36     while(choice != 1 && choice != 2 && choice != 3)
 37     {
 38         cout << "Not a valid operation" << endl;
 39         cout << "(1) Read, (2) Write, or (3) Modify? ";
 40         cin >> choice;
 41     }
 42
 43     if(choice == 1)
 44     {
 45         readFile(filename, file);
 46     }
 47      else if(choice == 2)
 48     {
 49         writeFile(filename, file);
 50     }
 51     else
 52     {
 53         modifyFile(filename, file);
 54     }
 55
 56     file.close();
 57 }
 58
 59 void openFile(string &filename, fstream &file)
 60 {
 61     cout << "Choose a file: ";
 62     cin >> filename;
 63
 64     file.open(filename, ios::in | ios::out | ios::binary);
 65     while(file.fail())
 66     {
 67         cout << "Cannot read that file" << endl;
 68         cout << "Choose a file: ";
 69         cin >> filename;
 70         file.open(filename, ios::in | ios::out | ios::binary);
 71     }
 72 }