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 =={{header|C++}}==
 Uses some Microsoft library:
-<lang cpp>#include <fstream>
+<lang cpp>#include <direct.h>
-#include <direct.h>
+#include <fstream>
 int main() {
-	std::fstream f( "output.txt", std::ios::out );
+    std::fstream f("output.txt", std::ios::out);
-	f.close();
+    f.close();
-	f.open( "/output.txt", std::ios::out );
+    f.open("/output.txt", std::ios::out);
-	f.close();
+    f.close();
-	_mkdir( "docs" );
+    _mkdir("docs");
-	_mkdir( "/docs" );
+    _mkdir("/docs");
-	return 0;
+    return 0;
+}</lang>
+A cross-platform solution using C++17
+<lang cpp>#include <filesystem>
+#include <fstream>
+namespace fs = std::filesystem;
+int main() {
+    std::fstream f("output.txt", std::ios::out);
+    f.close();
+    f.open("/output.txt", std::ios::out);
+    f.close();
+    fs::create_directory("docs");
+    fs::create_directory("/docs");
 }</lang>