C++ fstream append to text file

Introduction

To append text to an existing file, we include the std::ios::app flag inside the file stream constructor:

#include <fstream> 

int main() //from w  w w . jav a 2 s  .c om
{ 
    std::fstream fs{ "myoutputfile.txt", std::ios::app }; 
    fs << "This is appended text" << '\n'; 
    fs << "This is also an appended text." << '\n'; 
}

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