打开并写入现有的fstream而不用C ++中的覆盖/清除

Question

I have an existing txt file, I want to be able to write stuff to it (on the next line) without modifying the existing contents. What's a good way to do this?

#include <iostream>
ofstream myfile ("ex.txt"); 

seems to clear all the existing text.

Answer 1

ofstream myfile ("ex.txt", ios_base::app); will open a file in append mode. Each write operation will append to the existing contents.

Answer 2

使用ios_base::app标志打开文件