--%>
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 : Write a recursive implementation of

    Assignment 5 Selecting Array Elements Implement the following C++ code in assembly language, using the block-structured .IF and .WHILE directives. Assume that all variables are 32-bit signed integers: int array[] = {10,60,20,33,72,89,45,65,72,18}; int sample = 50; intArraySize = s

    		•
  • Q : Define Preempt Preempt: It is the

    Preempt: It is the presently executing thread might be preempted, or forced to give up control, by a higher priority thread which becomes eligible to run throughout its time slice.

    		•
  • Q : Define Continue statement Continue

    Continue statement: A statement which might only be employed within the body of a loop. In case of a while loop or do loop, control passes instantly to the loop's terminating test. In case of a for loop, the control passes to the post-body update expr

    		•
  • Q : What is Control structure Control

    Control structure: A statement which affects the flow of control in a method. The typical control structures are if statements and loops.

    		•
  • Q : Define the term Assignment statement

    Define the term Assignment statement: It is a statement employing the assignment operator.

    		•
  • Q : What is Native Mode Native Mode :

    Native Mode: Whenever all the domain controllers in a specified domain are executing Windows 2000 Server. This mode permits organizations to take benefit of new Active Directory features like Universal groups, nested group membership, and the inter-do

    		•
  • Q : Define the term Trusted applet Define

    Define the term Trusted applet: It is an applet with additional privileges than an ordinary (that is, untrusted) applet.

    		•
  • Q : Define Single line comment Single line

    Single line comment: A comment is in the form:     // this line will be avoided by the compiler.

    		•
  • Q : Define Loop variable Loop variable : A

    Loop variable: A variable employed to control the operation of a loop, like a for loop. Usually, a loop variable will be provided an initial value and it is then incremented after each and every iteration till it passes or reaches a terminating value.

    		•
  • Q : Define Absolute filename Absolute

    Absolute filename: It is a filename whose full path is unambiguously provided starting from the top (that is, root) of a file system tree. For example: c:\Java\bin\javac.exe

    		•