--%>
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 : Define Number of Threads Number of

    Number of Threads: Threads can be a useful abstraction and implementation mechanism to partition independent program actions. However, when there is coordination (or interference) between these threads, the required synchronization mechanisms increase

    		•
  • Q : Describe Method result Method result :

    Method result: The value returned from a method through a return statement. The kind of expression in the return statement should match the return type declared in method header.

    		•
  • Q : State HyperText Transfer Protocol

    HyperText Transfer Protocol: The HyperText Transfer Protocol (abbreviated as HTTP) is a set of rules stated to enable a Web client (that is, browser) to interact with the Web server.

    		•
  • Q : Explain Redundant value Redundant value

    Redundant value: The value of a data type which has no use or meaning in a particular context. For example, negative values would be redundant a class employing integer attributes to the model assignment marks. In several applications, redundant patte

    		•
  • Q : Define the Binding of Instructions and

    Define the Binding of Instructions and Data to Memory?

    		•
  • Q : Scalability aspects of a Java PathFinder

    Scalability of program model checkers such as JPF encompasses two aspects: How large a program can be model checked, and Once a defect has been detected, how readily meaningful debugging informati

    		•
  • Q : Meaning of active and passive objects

    Illustrate in brief the meaning of active and passive objects?

    		•
  • Q : Explain Test Object Model Define the

    Define the terms Test Object Model, Test Object and Run-Time object?

    		•
  • Q : Various controls of ASP.NET AJAX Name

    Name the various controls of ASP.NET AJAX?

    		•
  • Q : Explain Command-line argument

    Command-line argument: The arguments passed to a program whenever it is run. The Java program receives such in the single formal argument to its major method: public static void main(String[] args)

    		•