ssrs fixed data matrix The two notations in Software

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The two notations
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(*p).data p->data
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have the same meaning. When working with pointers objects, the arrow symbol 4 is preferred because it is simpler and it suggests the thing to which p points. Here is a more important example:
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CHAP. 81
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CLASSES
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EXAMPLE 8.13 A Node Class for Linked Lists
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This defines a Node class each of whose objects contain an int data member and a next pointer. The program allows the user to create a linked list in reverse. Then it traverses the list, printing each data value.
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class Node { public: Node(int d, Node* p=O) : data(d), next(p) { } int data; Node* next; >; main0 -t int n; Node* p; Node* q=O; while (tin >> n) { p = new Node(n, q); q = p; > for ( ; pvnext; p = p->next ) tout CC p->data << ' --> "; tout CC "*\n"; )
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First note that the definition of the Node class includes two references to the class itself. This is allowed because each reference is actually a pointer to the class. Also note that the constructor initializes both data members. The whi 1 e loop continues reading in t s into n until the user enters the end-of-file character (Control-D on Mac and UNIX systems, and Control-Z on DOS and VAX systems). Within the loop, it gets a new node, inserts the int into its data member, and connects the new node to the previous node (pointed to by q). Finally, the for loop traverses the list, beginning with the node pointed to by p (which is the last node constructed) and continuing until p- >next is NUL (in which case, p will be pointing to the last node in the list). The list constructed in this example can be visualized like this:
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[CHAP. 8
8.12 STATIC DATA MEMBERS
Sometimes a single value for a data member applies to all members of the class. In this case, it would be inefficient to store the same value in every object of the class. That can be avoided by declaring the data member to be static. This is done by including the static keyword at the beginning of the variable s declaration. It also requires that the variable be defined globally. So the syntax looks like this:
class X { public: static int n; 1 ; int X::n =
// declaration of n as a static data member
// definition of n
Static variables are automatically initialized to 0, so the explicit initialization in the definition is unnecessary unless you want it to have a non-zero initial value.
EXAMPLE 8.14 A static Data Member
The Widget class maintains a s tat i c data member count which keeps track of the number of Widget objects in existence globally. Each time a widget is created (by the constructor) the counter is incremented, and each time a widget is destroyed (by the destructor) the counter is decremented.
class Widget { public: Widget0 { ++count; } -Widget() { --count; } static int count; >; int Widget::count = 0;
main0 -C Widget w, x; tout << "Now there are -t Widget w, x, y, z; tout << "Now there > tout << "Now there are Widget y; tout << "Now there are
' CC w.count CC ' widgets.\n";
are ' C-C w.count -KC ' widgets.\n"; ' CC w.count << ' widgets.\n"; ' << w.count << ' widgets.\n";
Nuw there are .2 widget;s*
.,..
Notice how four widgets are created inside the inner block, and then they are destroyed when program control leaves that block, reducing the global number of widgets from 6 to 2.
CHAP. 81
CLASSES
A static data member is like an ordinary global variable: only one copy of the variable exists no matter how many instances of the class exist. The main difference is that it is a data member of the class, and so may be private.
EXAMPLE 8.15 A static Data Member that is private class Widget { public: Widget0 ( ++count; } -Widget() { --count; } int numWidgets() { return count; } private: static int count; > ; int Widget::count = 0;
main0 { Widget w, x; tout -c-c Now there are 'I -C-C w.numMdgets() << 'I widgets.\n"; 1 Widget w, x, y, z; tout << Now there are ' -CC w.numWidgets() -CC ' widgets.\n";
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