Tag: tutorial

All the articles with the tag "tutorial".

• C++ Input Validation: Handling Bad cin Input Without Crashing

  Updated: 18 Sep, 2026

  Validate numeric input in C++ with cin.fail(), cin.clear() and cin.ignore(). Stop infinite loops when the user types letters, and build a reusable input function.

• How to Read a File Line by Line in C++

  Updated: 18 Sep, 2026

  Read a text file line by line in C++ with ifstream and getline. Includes error handling, reading into a vector, parsing each line, and the common gotchas.

• How to Replace a Substring in a C++ String

  Updated: 18 Sep, 2026

  Replace text inside a C++ string: replace one occurrence, replace all occurrences with a loop, and use std::string::replace by position. Copy-paste code included.

• How to Trim Whitespace from a String in C++

  Updated: 18 Sep, 2026

  Trim leading and trailing whitespace from a C++ string. Copy-paste trim, ltrim and rtrim functions using find_first_not_of, plus a C++20 ranges version.