qr code generator c# asp.net The Methods De ned by Stack in C#.NET

Painting QR Code 2d barcode in C#.NET The Methods De ned by Stack

The Methods De ned by Stack
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25:
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Collections, Enumerators, and Iterators
Printing Quick Response Code In .NET Framework
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QR Code Generator In VS .NET
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Here is an example that creates a stack, pushes several integers onto it, and then pops them off again:
Print QR-Code In Visual Basic .NET
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// Demonstrate the Stack class using System; using SystemCollections; class StackDemo { static void ShowPush(Stack st, int a) { stPush(a); ConsoleWriteLine("Push(" + a + ")"); ConsoleWrite("stack: "); foreach(int i in st) ConsoleWrite(i + " "); ConsoleWriteLine(); } static void ShowPop(Stack st) { ConsoleWrite("Pop -> "); int a = (int) stPop(); ConsoleWriteLine(a); ConsoleWrite("stack: "); foreach(int i in st) ConsoleWrite(i + " "); ConsoleWriteLine(); } static void Main() { Stack st = new Stack(); foreach(int i in st) ConsoleWrite(i + " "); ConsoleWriteLine(); ShowPush(st, 22); ShowPush(st, 65); ShowPush(st, 91); ShowPop(st); ShowPop(st); ShowPop(st);
UCC-128 Generator In C#.NET
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PART II
Drawing Bar Code In C#
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Part II:
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try { ShowPop(st); } catch (InvalidOperationException) { ConsoleWriteLine("Stack empty"); } } }
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Here s the output produced by the program Notice how the exception handler for InvalidOperationException manages a stack underflow
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Paint Bar Code In .NET
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Push(22) stack: 22 Push(65) stack: 65 22 Push(91) stack: 91 65 22 Pop -> 91 stack: 65 22 Pop -> 65 stack: 22 Pop -> 22 stack: Pop -> Stack empty
Queue
Another familiar data structure is the queue, which is a first-in, first-out list That is, the first item put in a queue is the first item retrieved Queues are common in real life For example, lines at a bank or fast-food restaurant are queues In programming, queues are used to hold such things as the currently executing processes in the system, a list of pending database transactions, or data packets received over the Internet They are also often used in simulations The collection class that supports a queue is called Queue It implements the ICollection, IEnumerable, and ICloneable interfaces Queue is a dynamic collection that grows as needed to accommodate the elements it must store When more room is needed, the size of the queue is increased by a growth factor, which, by default, is 20 Queue defines the following constructors: public Queue( ) public Queue (int capacity) public Queue (int capacity, oat growFactor) public Queue (ICollection col) The first form creates an empty queue with a default capacity and uses the default growth factor of 20 The second form creates an empty queue with the initial capacity specified by capacity and a growth factor of 20 The third form allows you to specify a growth factor in growFactor (which must be between 10 and 100) The fourth form creates a queue that contains the elements of the collection specified by col, and an initial capacity equal to the number of elements In this form, the default growth factor of 20 is used In addition to the methods defined by the interfaces that it implements, Queue defines the methods shown in Table 25-8 In general, here is how you use Queue To put an object in the queue, call Enqueue( ) To remove and return the object at the front of the queue,
25:
Collections, Enumerators, and Iterators
Method public virtual void Clear( ) public virtual bool Contains(object obj) public virtual object Dequeue( ) public virtual void Enqueue(object obj) public virtual object Peek( ) public static Queue Synchronized(Queue queue) public virtual object[ ] ToArray( ) public virtual void TrimToSize( )
TABLE 25-8 The Methods De ned by Queue
Description Sets Count to zero, which effectively clears the queue Returns true if obj is in the invoking queue If obj is not found, false is returned Returns the object at the front of the invoking queue The object is removed in the process Adds obj to the end of the queue Returns the object at the front of the invoking queue, but does not remove it
PART II
Returns a synchronized version of queue Returns an array that contains copies of the elements of the invoking queue Sets Capacity to Count
call Dequeue( ) You can use Peek( ) to return, but not remove, the next object An InvalidOperationException is thrown if you call Dequeue( ) or Peek( ) when the invoking queue is empty Here is an example that demonstrates Queue:
// Demonstrate the Queue class using System; using SystemCollections; class QueueDemo { static void ShowEnq(Queue q, int a) { qEnqueue(a); ConsoleWriteLine("Enqueue(" + a + ")"); ConsoleWrite("queue: "); foreach(int i in q) ConsoleWrite(i + " "); ConsoleWriteLine(); } static void ShowDeq(Queue q) { ConsoleWrite("Dequeue -> "); int a = (int) qDequeue(); ConsoleWriteLine(a); ConsoleWrite("queue: "); foreach(int i in q) ConsoleWrite(i + " "); ConsoleWriteLine(); }
Part II:
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