How to Append Text to Files in C ?

Appending Text to Text Files in C

In C , appending text to a text file requires understanding the appropriate open mode. When aiming to create a new text file if it doesn't exist and append text to it if it does, specify the append open mode: std::ios_base::app.

The following code snippet demonstrates this:

#include <fstream>

int main() {
  std::ofstream outfile;
  outfile.open("test.txt", std::ios_base::app); // append instead of overwrite
  outfile << "Data";  // Appends "Data" to the file
  return 0;
}

In this code, the outfile is opened with std::ios_base::app mode, ensuring that it appends to the existing "test.txt" file if it exists and creates a new one if it doesn't. Subsequently, the text "Data" is written to the file using the << operator.

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