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<TITLE>Default Constructor</TITLE>
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<b>Data Structures and Algorithms
with Object-Oriented Design Patterns in C++</b><br>
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<H3><A NAME="SECTION0018321000000000000000">Default Constructor</A></H3>
<P>
The constructor which takes no arguments
is called the <em>default constructor</em><A NAME=57288> </A>.
E.g., the default constructor is invoked
when a variable is declared like this:
<PRE>Complex c;</PRE>
In fact, the compiler will generate its own default constructor for a class
provided that no other constructors have been defined by the programmer.
The compiler generated default constructor initializes the
member variables of the class using their respective default constructors.
<P>
Program <A HREF="page599.html#progcomplex1c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page599.html#progcomplex1c"><IMG ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A> gives the implementation of the default
constructor of the <tt>Complex</tt> class.
Because the implementation the member function is given outside
of the class definition,
the name of the function is prefixed with the class name
followed by <tt>::</tt>.
<P>
<P><A NAME="57738"> </A><A NAME="progcomplex1c"> </A> <IMG WIDTH=575 HEIGHT=353 ALIGN=BOTTOM ALT="program57292" SRC="img2602.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img2602.gif" ><BR>
<STRONG>Program:</STRONG> <tt>Complex</tt> Class Constructors and Destructor<BR>
<P>
<P>
The default constructor explicitly invokes the constructors
for the member variables <tt>real</tt> and <tt>imag</tt> (line 2).
After the member variables have been initialized,
the body of the constructor runs.
In this case, the body of the constructor is empty (line 3).
<P>
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