Question

Need to check if File is successfully opened? C++

It works when I input the right txt file. But, it keeps stating, File successfully open." even I put in a non-existing file.

Here are the specifications:

Develop a functional flowchart and then write a C++ program to solve the following problem.

Create a text file named first.txt and write your first name in the file. You will be reading the name of the file from the keyboard as a string, using the string class. Your program will also read your first name from the keyboard. The process of the file creation (name of the file, mode for opening the file, and testing the open success is done in a user-defined function. The function communicates the status of file open to the calling function).

Here is what I have:

#include<string>

#include <iostream>

#include <fstream>

#include <cstdlib>

using namespace std;

int main() {

   string file; //This is a declaration for a file name

   string firstname;
   ofstream myfile;   

   cout << "Please enter the file name of your first name:";   
   cin >> file;   

   myfile.open(file);
  
   if (myfile.is_open())
   {
       cout << "\nFile successfully open.\n";
  
   }
   else
   {
       cout << "Error opening file";
   }

   cout << "Please enter your first name:"; //asks the user to input first name
   cin >> firstname; //user inputs first name

   myfile << firstname;
   myfile.close(); //closes the file

Answer 1

#include<string>
#include <iostream>
#include <fstream>
#include <cstdlib>

using namespace std;

bool fileOpen(string fileName, ofstream &out, bool mode){
   out.open(fileName, mode);
   if(out.is_open()){
       return true;
   }
   else{
       return false;
   }
}

int main() {
   string file; //This is a declaration for a file name
   string firstname;
   ofstream myfile;   
   cout << "Please enter the file name of your first name:";   
   cin >> file;
   if (fileOpen(file, myfile, ios::out))
   {
       cout << endl << "File successfully opened." << endl;
       cout << "Please enter your first name:"; //asks the user to input first name
       cin >> firstname; //user inputs first name
       myfile << firstname;
       myfile.close(); //closes the file
   }
   else
   {
       cout << "Error opening file" << endl;
   }
}