--%>
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 : Explain Conditional operator

    Conditional operator: It is an operator taking three operands that is, a ternary operator. The conditional operator (?:) is employed in the form bexpr ? expr1 : expr2

    Q : Describe IEEE 754 IEEE 754 : The

    IEEE 754: The standard 754-1985 issued by Institute of Electrical and Electronic Engineers for the binary floating point arithmetic. It is the standard to which Java's arithmetic matches.

    		•
  • Q : Define Hardware Hardware : It is the

    Hardware: It is the physical devices of a computer system, like its micro-chips, keyboard, disk drives, printer, sound card, and so forth. It is termed `hardware' in contrary to programs, which are termed `software'.

    		•
  • Q : Overloading and overriding in the

    Illustrate the difference between overloading and overriding in the programming language?

    		•
  • Q : What is Pop-up menu Pop-up menu : A

    Pop-up menu: A menu of actions which is generally not visible on the screen till a mouse button is clicked. The Popup menus assist to keep a user interface from becoming cluttered.

    		•
  • Q : Define User Datagram Protocol User

    User Datagram Protocol: The User Datagram Protocol (abbreviated as UDP) is a set of rules which permit communication among two processes across a network. The protocol is unreliable, that means that information is not guaranteed to be

    		•
  • Q : Explain the way of the Orbeon Explain

    Explain the way of the Orbeon.

    		•
  • Q : Identify Customers in SQL The company

    The company wish to provide an incentive of free shipping to such customers who have not returned for 2 months. Build a procedure named PROMO_SHIP_SP which determines these customers are and then updates the BB_PROMOLIST table accordingly. The procedure employs the be

    		•
  • Q : Write a program using simple loop

    Objective:  The purpose of this problem is to gain experience with the principles necessary to write a program using simple loop, decision processing, counters and accumulators Save the Barns, a bi-partisan po

    		•
  • Q : Define the term Scheduler Define the

    Define the term Scheduler: The portion of the Java Virtual Machine (abbreviated as JVM) which is responsible for managing the threads.

    		•