Book Image

Modern C++ Programming Cookbook

By : Marius Bancila
Book Image

Modern C++ Programming Cookbook

By: Marius Bancila

Overview of this book

C++ is one of the most widely used programming languages. Fast, efficient, and flexible, it is used to solve many problems. The latest versions of C++ have seen programmers change the way they code, giving up on the old-fashioned C-style programming and adopting modern C++ instead. Beginning with the modern language features, each recipe addresses a specific problem, with a discussion that explains the solution and offers insight into how it works. You will learn major concepts about the core programming language as well as common tasks faced while building a wide variety of software. You will learn about concepts such as concurrency, performance, meta-programming, lambda expressions, regular expressions, testing, and many more in the form of recipes. These recipes will ensure you can make your applications robust and fast. By the end of the book, you will understand the newer aspects of C++11/14/17 and will be able to overcome tasks that are time-consuming or would break your stride while developing.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Using monetary I/O manipulators


In the previous recipe, we have looked at some of the manipulators that can be used to control the input and output streams. The manipulators discussed there were related to numeric and text values. In this recipe, we will see how to use standard manipulators to write and read monetary values.

Getting ready

You should be familiar with locales and how to set them for a stream. This topic is discussed in the Using localized settings for streams recipe. It is recommended that you read that recipe before continuing.

The manipulators discussed in this recipe are available in the std namespace in the <iomanip> header.

How to do it...

To write a monetary value to an output stream, you should do the following:

  • Set the desired locale for controlling the monetary format:
        std::cout.imbue(std::locale("en_GB.utf8"));
  • Use either a long double or a std::basic_string value for the amount:
        long double mon = 12345.67;
        std::string smon = "12345.67";
  • Use a...