file open cpp
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile;
myfile.open ("file.txt");
myfile << "Writing to a file.\n";
myfile.close();
return 0;
}file open cpp
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile;
myfile.open ("file.txt");
myfile << "Writing to a file.\n";
myfile.close();
return 0;
}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;
}Copyright © 2021 Codeinu
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