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c++ how to read from a file

Foolish Fish answered on January 10, 2022 Popularity 10/10 Helpfulness 4/10

answer c++ how to read from a file

related c++ read file

c++ how to read from a file

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#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;
}

Popularity 10/10 Helpfulness 4/10 Language cpp

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Tags: c++ file

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Contributed on Jan 10 2022

Foolish Fish

0 Answers Avg Quality 2/10

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c++ read file

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#include <fstream>
#include <string>

int main(int argc, char** argv)
{

  std::ifstream ifs("myfile.txt");
  std::string content( (std::istreambuf_iterator<char>(ifs) ),
                       (std::istreambuf_iterator<char>()    ) );

  return 0;
}

Popularity 9/10 Helpfulness 5/10 Language cpp

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Tags: c++

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Contributed on Aug 11 2023

julesgrc0

0 Answers Avg Quality 2/10

read text from file c++

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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: \n";
	if (file2.is_open()) {		//check if the file is open
      
		while (getline(file2, line)) {
			cout << line << endl;
		}
      	file2.close();
	}

Popularity 10/10 Helpfulness 4/10 Language cpp

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Tags: c++

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Contributed on Jun 26 2022

S.Y

0 Answers Avg Quality 2/10

c++ how to read file

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// Create a text string, which is used to output the text file
string myText;

// Read from the text file
ifstream MyReadFile("filename.txt");

// Use a while loop together with the getline() function to read the file line by line
while (getline (MyReadFile, myText)) {
  // Output the text from the file
  cout << myText;
}

// Close the file
MyReadFile.close(); 

//https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwi72ffun_D-AhXwh4sKHcB0A3UQFnoECAIQAQ&url=https%3A%2F%2Fwww.w3schools.com%2Fcpp%2Fcpp_files.asp&usg=AOvVaw1vZ4bdMEms4A0c4W27IrsT

Popularity 9/10 Helpfulness 3/10 Language cpp

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Tags: c++ file

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Contributed on May 12 2023

m_zsuetam

0 Answers Avg Quality 2/10

read and write file in c++

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#include<iostream>
#include<fstream>

using namespace std;

int main()
{

    string fileName;
    int choice;
    cout << "Enter txt file name:\n";
    cin >> fileName;
    cout << "Enter number of command:\n";
    cout << "1. Write file\n";
    cout << "2. Read file\n";
    cin >> choice;

    if (choice == 1)
    {
            ofstream myfile;
            string text;
            myfile.open (fileName);
            cout << "Write text below: \n"; //file must have no text
            cin >> text;
            myfile << text;
            myfile.close();
    }else if (choice == 2)
    {
            ifstream file(fileName);
            string line;

            if (file.is_open())
            {
	            while (getline(file, line))
                {
        	       cout << line << endl;
                }
    }
    }
    return 0;
}

Popularity 10/10 Helpfulness 3/10 Language cpp

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Tags: c++

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Contributed on Apr 28 2022

gocrazygh

0 Answers Avg Quality 2/10

cpp read from file

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freopen("filename.extension", "r", stdin);

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Jun 11 2022

Ma7moud7amdy

0 Answers Avg Quality 2/10

c++ how to read from a file

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