shikaku https://blog.hatena.ne.jp/shikaku/ shikaku's blog https://blog.systemjp.net/ CPP #include <fstream> using namespace std; int main( ) { ofstream ofs("data.txt"); string buf; if(ofs) { ofs << "OK" << endl; // cout に書き出すのと同じ感じで } return 0; }ネタ元 http://sato-si.at.webry.info/200711/article_3.html 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.systemjp.net%2Fentry%2F20091222%2Fp4" title="C++のファイル出力 fstreamの使い方 - shikaku&#39;s blog" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-12-22 00:00:00 rich https://blog.systemjp.net/entry/20091222/p4 1.0 100%