Exploring C++20: The Programmer's Introduction to C++

© Ray Lischner 2020

R. LischnerExploring C++20https://doi.org/10.1007/978-1-4842-5961-0_14

14. Introduction to File I/O

Ray Lischner¹ 

(1)

Ellicott City, MD, USA

 

Reading from standard input or writing to standard output works fine for many trivial programs, and it is a standard idiom for UNIX and related operating systems. Nonetheless, real programs must be able to open named files for reading, writing, or both. This Exploration introduces the basics of file I/O. Later Explorations will tackle more sophisticated I/O issues.

Reading Files

The most common file-related task in these early Explorations will involve reading from a file instead of from the standard input stream. One of the greatest benefits of this is it saves a lot of tedious typing. Some ...