THINK++ — Engineering Visualized

Data Output

Writing to Files

Using the ofstream class to create files and save data to the disk.

CODE EXAMPLE

#include <fstream>
using namespace std;

ofstream outFile("data.txt");
if (outFile.is_open()) {
    outFile << "Hello File!\n";
    outFile << 100 << endl;
    outFile.close();
}

OVERWRITE MODE

Default. Opens the file and truncates (deletes) existing content.

APPEND MODE

Use ios::app to add data to the end of an existing file.

The .is_open() Check

Always check if the file opened successfully. It might fail if the disk is full, the folder is read-only, or the file is locked by another app.

Loading Lab...

Writing To Files

Writing To Files

Writing to Files

Writing to Files