CPP

how to open and read text files in c++

// This is how you read a file, and keep it's text in a vector of strings
#include <bits/stdc++.h>
using namespace std;

vector<string> Read_File(string FileName){
    ifstream infile;
    infile.open(FileName);
    vector<string> empty;
    if(infile.fail()){
        cout << "File Could Not Be Reached";
        return empty;
    }
    vector<string> answer;
    while(infile.good()){
        string str;
        infile >> str;
        answer.push_back(str);
    }
    infile.close();
    return answer;
}
int main(){
  vector<string> file_text = Read_File("textfile.txt");
}

read text from file c++

fstream input;
	input.open("Data.txt", ios::in);
	string city;
	if (input.fail())
	{
		cout << "File does not exist" << endl;
		cout << "Exit program" << endl;
	}

	while (!input.eof()) // Continue if not end of file
	{
		getline(input, city, '.');//getline(file,string,delimit char)
		cout << city << endl;
	}

	input.close();

                            //Another solution

fstream file2;
	file2.open("Data.txt", ios::in);
	string line;
	cout << "Data file: 
";
	if (file2.is_open()) {		//check if the file is open
      
		while (getline(file2, line)) {
			cout << line << endl;
		}
      	file2.close();
	}

c++ how to read from a file

#include <fstream>
#include <iostream>

using namespace std;

int main() {
    /* You create a stream using the file in a 
     * similar way to how we use other streams.
     */
    ifstream in;
    // Open the file
    in.open("names.txt");
    if(in.fail())
        cout << "File didn't open"<<endl;

    int count = 0;
    string line;
    while (true) {
        /* Get line will work as long as there is
         * a line left. Once there are no lines 
         * remaining it will fail. 
		 */
        getline(in, line);  
        if (in.fail()) break;
        
        /* Process the line here. In this case you are
         * just counting the lines.
         */
        count ++;
    }
    
    cout << "This file has " << count << " lines." << endl;
    return 0;
}