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C++ Language Tutorial








Written by: Juan Soulié
Last revision: June, 2007



Available online at: http://www.cplusplus.com/doc/tutorial/
The online version is constantly revised and may contain corrections and changes
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Table of contents
Table of contents ...............................................................................................................................3
Introduction ......................................................................................................................................5
Instructions for use ................................................................................................................................... 5
Basics of C++ ......................................................................................................................................7
Structure of a program ............................................................................................................................. 7
Variables. Data Types. ............................................................................................................................. 11
Constants ................................................................................................................................................ 17
Operators ................................................................................................................................................ 21
Basic Input/Output .................................................................................................................................. 29
Control Structures ............................................................................................................................ 34
Control Structures ................................................................................................................................... 34
Functions (I) ............................................................................................................................................ 41
Functions (II) ........................................................................................................................................... 47
Compound data types ...................................................................................................................... 54
Arrays ...................................................................................................................................................... 54
Character Sequences .............................................................................................................................. 60
Pointers ................................................................................................................................................... 63
Dynamic Memory .................................................................................................................................... 74
Data structures........................................................................................................................................ 77
Other Data Types .................................................................................................................................... 82
Object Oriented Programming .......................................................................................................... 86
Classes (I)................................................................................................................................................. 86
Classes (II) ............................................................................................................................................... 95
Friendship and inheritance ................................................................................................................... 100
Polymorphism ....................................................................................................................................... 107
Advanced concepts ........................................................................................................................ 113
Templates.............................................................................................................................................. 113
Namespaces .......................................................................................................................................... 120
Exceptions ............................................................................................................................................. 123
Type Casting .......................................................................................................................................... 127
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Preprocessor directives ......................................................................................................................... 133
C++ Standard Library ...................................................................................................................... 138
Input/Output with files ......................................................................................................................... 138
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Introduction
Instructions for use
To whom is this tutorial directed?
This tutorial is for those people who want to learn programming in C++ and do not necessarily have any previous
knowledge of other programming languages. Of course any knowledge of other programming languages or any
general computer skill can be useful to better understand this tutorial, although it is not essential.
It is also suitable for those who need a little update on the new features the language has acquired from the latest
standards.
If you are familiar with the C language, you can take the first 3 parts of this tutorial as a review of concepts, since
they mainly explain the C part of C++. There are slight differences in the C++ syntax for some C features, so I
recommend you its reading anyway.
The 4th part describes object-oriented programming.
The 5th part mostly describes the new features introduced by ANSI-C++ standard.
Structure of this tutorial
The tutorial is divided in 6 parts and each part is divided on its turn into different sections covering a topic each
one. You can access any section directly from the section index available on the left side bar, or begin the tutorial
from any point and follow the links at the bottom of each section.
Many sections include examples that describe the use of the newly acquired knowledge in the chapter. It is
recommended to read these examples and to be able to understand each of the code lines that constitute it before
passing to the next chapter.
A good way to gain experience with a programming language is by modifying and adding new functionalities on
your own to the example programs that you fully understand. Don't be scared to modify the examples provided
with this tutorial, that's the way to learn!
Compatibility Notes
The ANSI-C++ standard acceptation as an international standard is relatively recent. It was first published in
November 1997, and revised in 2003. Nevertheless, the C++ language exists from a long time before (1980s).
Therefore there are many compilers which do not support all the new capabilities included in ANSI-C++, especially
those released prior to the publication of the standard.
This tutorial is thought to be followed with modern compilers that support -at least on some degree- ANSI-C++
specifications. I encourage you to get one if yours is not adapted. There are many options, both commercial and
free.
Compilers
The examples included in this tutorial are all console programs. That means they use text to communicate with
the user and to show their results.
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All C++ compilers support the compilation of console programs. Check the user's manual of your compiler for more
info on how to compile them.
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Basics of C++
Structure of a program
Probably the best way to start learning a programming language is by writing a program. Therefore, here is our
first program:
// my first program in C++

#include
using namespace std;

int main ()
{
cout << "Hello World!";
return 0;
}
Hello World!
The first panel shows the source code for our first program. The second one shows the result of the program once
compiled and executed. The way to edit and compile a program depends on the compiler you are using. Depending
on whether it has a Development Interface or not and on its version. Consult the compilers section and the manual
or help included with your compiler if you have doubts on how to compile a C++ console program.
The previous program is the typical program that programmer apprentices write for the first time, and its result is
the printing on screen of the "Hello World!" sentence. It is one of the simplest programs that can be written in
C++, but it already contains the fundamental components that every C++ program has. We are going to look line
by line at the code we have just written:
// my first program in C++
This is a comment line. All lines beginning with two slash signs (//) are considered comments and do not
have any effect on the behavior of the program. The programmer can use them to include short
explanations or observations within the source code itself. In this case, the line is a brief description of
what our program is.
#include
Lines beginning with a hash sign (#) are directives for the preprocessor. They are not regular code lines
with expressions but indications for the compiler's preprocessor. In this case the directive #include
tells the preprocessor to include the iostream standard file. This specific file (iostream)
includes the declarations of the basic standard input-output library in C++, and it is included because its
functionality is going to be used later in the program.
using namespace std;
All the elements of the standard C++ library are declared within what is called a namespace, the
namespace with the name std. So in order to access its functionality we declare with this expression that
we will be using these entities. This line is very frequent in C++ programs that use the standard library,
and in fact it will be included in most of the source codes included in these tutorials.
int main ()
This line corresponds to the beginning of the definition of the main function. The main function is the point
by where all C++ programs start their execution, independently of its location within the source code. It
does not matter whether there are other functions with other names defined before or after it - the
instructions contained within this function's definition will always be the first ones to be executed in any
C++ program. For that same reason, it is essential that all C++ programs have a main function.
The word main is followed in the code by a pair of parentheses (()). That is because it is a function
declaration: In C++, what differentiates a function declaration from other types of expressions are these
parentheses that follow its name. Optionally, these parentheses may enclose a list of parameters within
them.
Right after these parentheses we can find the body of the main function enclosed in braces ({}). What is
contained within these braces is what the function does when it is executed.
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cout << "Hello World!";
This line is a C++ statement. A statement is a simple or compound expression that can actually produce
some effect. In fact, this statement performs the only action that generates a visible effect in our first
program.
cout represents the standard output stream in C++, and the meaning of the entire statement is to insert
a sequence of characters (in this case the Hello World sequence of characters) into the standard output
stream (which usually is the screen).
cout is declared in the iostream standard file within the std namespace, so that's why we needed to
include that specific file and to declare that we were going to use this specific namespace earlier in our
code.
Notice that the statement ends with a semicolon character (;). This character is used to mark the end of
the statement and in fact it must be included at the end of all expression statements in all C++ programs
(one of the most common syntax errors is indeed to forget to include some semicolon after a statement).
return 0;
The return statement causes the main function to finish. return may be followed by a return code (in our
example is followed by the return code 0). A return code of 0 for the main function is generally interpreted
as the program worked as expected without any errors during its execution. This is the most usual way to
end a C++ console program.
You may have noticed that not all the lines of this program perform actions when the code is executed. There were
lines containing only comments (those beginning by //). There were lines with directives for the compiler's
preprocessor (those beginning by #). Then there were lines that began the declaration of a function (in this case,
the main function) and, finally lines with statements (like the insertion into cout), which were all included within
the block delimited by the braces ({}) of the main function.
The program has been structured in different lines in order to be more readable, but in C++, we do not have strict
rules on how to separate instructions in different lines. For example, instead of
int main ()
{
cout << " Hello World!";
return 0;
}
We could have written:
int main () { cout << "Hello World!"; return 0; }
All in just one line and this would have had exactly the same meaning as the previous code.
In C++, the separation between statements is specified with an ending semicolon (;) at the end of each one, so
the separation in different code lines does not matter at all for this purpose. We can write many statements per
line or write a single statement that takes many code lines. The division of code in different lines serves only to
make it more legible and schematic for the humans that may read it.
Let us add an additional instruction to our first program:
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// my second program in C++

#include
using namespace std;

int main ()
{
cout << "Hello World! ";
cout << "I'm a C++ program";
return 0;
}
Hello World! I'm a C++ program
In this case, we performed two insertions into cout in two different statements. Once again, the separation in
different lines of code has been done just to give greater readability to the program, since main could have been
perfectly valid defined this way:
int main () { cout << " Hello World! "; cout << " I'm a C++ program "; return 0; }
We were also free to divide the code into more lines if we considered it more convenient:
int main ()
{
cout <<
"Hello World!";
cout
<< "I'm a C++ program";
return 0;
}
And the result would again have been exactly the same as in the previous examples.
Preprocessor directives (those that begin by #) are out of this general rule since they are not statements. They are
lines read and processed by the preprocessor and do not produce any code by themselves. Preprocessor directives
must be specified in their own line and do not have to end with a semicolon (;).
Comments
Comments are parts of the source code disregarded by the compiler. They simply do nothing. Their purpose is only
to allow the programmer to insert notes or descriptions embedded within the source code.
C++ supports two ways to insert comments:
// line comment
/* block comment */
The first of them, known as line comment, discards everything from where the pair of slash signs (//) is found up
to the end of that same line. The second one, known as block comment, discards everything between the /*
characters and the first appearance of the */ characters, with the possibility of including more than one line.
We are going to add comments to our second program:
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/* my second program in C++
with more comments */

#include
using namespace std;

int main ()
{
cout << "Hello World! "; // prints Hello
World!
cout << "I'm a C++ program"; // prints I'm a
C++ program
return 0;
}
Hello World! I'm a C++ program
If you include comments within the source code of your programs without using the comment characters
combinations //, /* or */, the compiler will take them as if they were C++ expressions, most likely causing one or
several error messages when you compile it.