--%>
Assignment Help - homework help

New Operator and Delete Operator

New operator: It allows dynamic storage allocation. It throws an exception if memory allocation fails. The general format of new operator is return type, pointer to data type.

The C++ statement

Allocates memory to variable ptrvar dynamically of specified data type and specified size. The operator new allocates a specified amount of memory during run time and returns a pointer to that memory allocation. It compares the size of memory allocated by

Size of (data type) * integer type size;

Where data type can be a standard data type or a user defined data type, integer size can be an integer expression, which specifies the number of element in the array. The new operators returns the NULL, if memory allocation is unsuccessful

Example:   Int * a = new (100);

It creates a memory for an integer and initializes it with 100.

Delete operator: This is used to return the memory allocated by new operator back to the memory pull. Memory thus released will be reused for other part of programme. Although memory allocated by is returned automatically to the system. When the programme terminates it is safer to use this operator explicitly within the pointer. This is absolutely necessary in situations where local variable pointing to the memory get destroyed when the function terminates leaving memory inaccessible to the rest of the delete operator is-

Deal locates the memory allocates to ptrvar. By de allocating the memory, the pointer variable does not get deleted and the address value stored in it does not change. However this address become invalid, as the returned memory will be used up for storing entirely different data. 

   Related Questions in Programming Languages

  • Q : What do you mean by java AWT What do

    What do you mean by the term java AWT? Describe in brief.

    		•
  • Q : Explain Right shift operator Right

    Right shift operator: Right shift operator (>>) is the bit manipulation operator. It shifts the bits in its left operand zero (0) or many places to the right, according to the value of its accurate operand. The most important bit from before the

    		•
  • Q : Define Double buffering Double

    Double buffering: A graphics method employed to smooth animation. The later version of an image is drawn `at the back the scenes' and then exhibited in its totality whenever the drawing is finished. The supposition is that it will be relatively fast t

    		•
  • Q : Illustrates the parts of an XML

    Illustrates the parts of an XML document are case-sensitive.

    		•
  • Q : Define the term Stack trace Define the

    Define the term Stack trace: It is a display of the runtime stack.

    		•
  • Q : Define difference between write through

    Define the difference between write through and write back cache?

    		•
  • Q : Explain the segmentation with paging

    Explain the segmentation with paging.

    		•
  • Q : Define the term Graphical User Interface

    Graphical User Interface: A Graphical User Interface (abbreviated as GUI) is a part of a program which permits user interaction through graphical components, like menus, buttons, text areas, and so forth. Interaction frequently includes the usage of a

    		•
  • Q : What is First in-first out First in,

    First in, first out: It is FIFO semantics of the queue data structure. Items are eliminated in the order in which they arrived in the queue; therefore older items are always eliminated before newer ones.

    		•
  • Q : Define Stream class Stream class : An

    Stream class: An input stream class is one which delivers data from its source (frequently the file system as a series of bytes. Likewise, an output stream class will write byte-level data. The stream classes must be contrasted with the operation of r

    		•