read a file c++
// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main () {
string line;
ifstream myfile ("example.txt");
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
//use line here
}
myfile.close();
}
else cout << "Unable to open file";
return 0;
}how to read and write in a file c++
#include <iostream>
#include <fstream>
using namespace std;
ifstream file_variable; //ifstream is for input from plain text files
file_variable.open("input.txt"); //open input.txt
file_variable.close(); //close the file stream
/*
Manually closing a stream is only necessary
if you want to re-use the same stream variable for a different
file, or want to switch from input to output on the same file.
*/
_____________________________________________________
//You can also use cin if you have tables like so:
while (cin >> name >> value)// you can also use the file stream instead of this
{
cout << name << value << endl;
}
_____________________________________________________
//ifstream file_variable; //ifstream is for input from plain text files
ofstream out_file;
out_file.open("output.txt");
out_file << "Write this scentence in the file" << endl;write to file in c++
++ cCopy#include <iostream>
#include <fstream>
using std::cout; using std::ofstream;
using std::endl; using std::string;
using std::fstream;
int main()
{
string filename("tmp.txt");
fstream file_out;
file_out.open(filename, std::ios_base::out);
if (!file_out.is_open()) {
cout << "failed to open " << filename << '\n';
} else {
file_out << "Some random text to write." << endl;
cout << "Done Writing!" << endl;
}
return EXIT_SUCCESS;
}Copyright © 2021 Codeinu
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