opening file in 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;
}
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4.33
6
// basic file operations
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile;
myfile.open ("example.txt");
myfile << "Writing this to a file.\n";
myfile.close();
return 0;
}
Thank you!
6
0
0
0
/ fstream::open / fstream::close
#include <fstream> // std::fstream
int main () {
std::fstream fs;
fs.open ("test.txt", std::fstream::in | std::fstream::out | std::fstream::app);
fs << " more lorem ipsum";
fs.close();
return 0;
}
Thank you!
0
0
4.33
9
#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;
Thank you!
9
0
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