C++ ClassesLesson 41Free preview

C++ Files

This lesson is part of C++ · All levels

Summary

C++ can read and write text files using stream objects from the header <fstream>: ofstream for writing, ifstream for reading, and fstream for both. The workflow always opens the file, checks success with is_open(), processes the data, and then closes the file. This ability allows the program to store data between run times, not just in temporary memory.

Key points

Ifstream writes, ifstream reads, fstream can do both.
The ios::app mode adds data at the end of the file, the ios::trunc empties the existing file.
Always check before performing a read/write operation.
Getline(stream, string) is used to read a complete line including spaces.

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