Appending a new line in a file(log file) in c++

Question

I have a logging functionality and in this I have got log files. Now every time I run the program I want that previously written file should not get deleted and should be ap

Answer 1

Use something like:

#include 
#include 
using namespace std;
int main() {
  ofstream out("try.txt", ios::app);
  out << "Hello, world!\n";
  return 0;
}

The ios:app option makes the output get appended to the end of the file instead of deleting its contents.