Exercises, examples and other material relating to training module C235. This topic is presented on public courses Learning to program in C and C++, C++ for C Programmers, C and C++ Programming, Learning to program in C and C++, C and C++ Programming

The C++ streams library and output formatters provide you with an Object Oriented approach to user and file interaction. You can define an object's behaviour - which is much more efficient than having to format your output every single time.

Articles and tips on this subject		updated
4563	Formatting and outputting your own classes in C++ When you output an object in C++, you pass it to an output stream such as std::cout or cout. If the thing you're outputting is a string, or an integer, float, some other primitive or a standard system object, that's all you need to do and the formatting is taken care of for you. But what if you're ...	2015-10-30
4562	Left shift operator on an output stream object - C++ When explaining "Hello World" in C++ (see here), delegates who are already familiar with programming in other languages pick up on the line   cout << "Welcome - and enjoy your C++ course" << endl; and ask for an explanation. Yes - it is a bit different, isn't it? The explanation ...	2015-10-30
3807	Reading (and writing) files in C++ "But how do I read data from a file ....?". Question on a C++ course on which we had concentrates, thus far, on object orientation. In summary: 1. Include the fstream header file 2. Create an object of type ifstream using the constructor, and passing in the file name 3. Read lines from the ifstream ...	2012-08-11
3810	Reading files, and using factories to create vectors of objects from the data in C++ On our C++ courses, we concentrate on objects and object design. But we also take a wider look at topics such as references and templates that go to making the complete language, with sections covering changes to things like file handling from the underlying C language. I've just added a new example ...	2012-08-11
3390	Printing objects in C++ Overloading operators with methods is a great way of providing a shorthand using the operator syntax for common things you want to do with objects. In other words - it's much easier to write:   c = a + b than   c = a.addition(b) ans it's also much easier for the maintainance ...	2011-08-13
3252	C++ - unknown array size, unknown object type. Help! There are time when you're writing a program where you say "I don't know". • I don't know how many records / object I'm going to read from a data file into an array - so I can't set the size of my array • I don't know what sort of object I'll be creating from a line I've read from a data ...	2011-04-17
3124	C++ - putting the language elements together into a program On the final day of the C++ course yesterday, I demonstrated a number of advanced features and pulled together various strands that we had been learning through the week. At one level, each feature of the language can be explained and taught, but there's a further level that's need to show how they ...	2011-01-08
1675	Comparing Objects in C++ Comparing two objects You can run a method on an object in C++ (or in any other OO language) to find an attribute of that object - let's say how costly it is (example, how costly it is to jave your group see a film). But you can't really run a method on TWO or more objects, which is what you would ...	2008-06-13
1478	Some new C programming examples - files, structs, unions etc A series of new "C" examples have been added to the web site - a course for a small group allowed me to go somewhat away from the more normal run yesterday and write some new illustrations in front of them. Call by value v call by pointer comparison: link Using extern to share a variable between two ...	2007-12-19

Person.cpp	for use in print object demo
Person.h	header file for object output demo
boring.data	Sample data for C++ course examples
comb.cpp	Reading and writing files, file names from command line
cppdata.cpp	Reading data from a file
file01.cpp	File handling with C++ streams
flow2.cpp	Factory method and file input to seed objects
fpri.cpp	Formatting floating point numbers in C++
fullapp.cpp	Shell for full application
fullapp2.cpp	Wholesale factory - a single call to make many objects
ioex.cpp	Stream demonstration
makefile	Compile / Load instructions for examples in this module
mtbsprint.cpp	implicit formatting to print an object
nine.cpp	Outputting an object via a stream
stdcodes.xyz	Sample data file ...