fstream read write mode code example
Example 1: how to read and write in a file c++
#include <iostream>
#include <fstream>
using namespace std;
ifstream file_variable;
file_variable.open("input.txt");
file_variable.close();
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while (cin >> name >> value)
{
cout << name << value << endl;
}
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ofstream out_file;
out_file.open("output.txt");
out_file << "Write this scentence in the file" << endl;
Example 2: opening file in c++
/ fstream::open / fstream::close
#include <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;
}
Example 3: fstream read write mode
stream file;
file.open(fileName,ios::in | ios::out);