--%>
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 Constructor Constructor : A

    Constructor: A constructor is automatically called whenever an instance of its class is formed. A constructor always has similar name as its class, and encompass no return type. For example: public

    		•
  • Q : Define the term createWindow object

    Define the term createWindow object? Answer: reateWindow() physically makes the Window in memory  based upon the earlier registered WND

    		•
  • Q : Describe Timers Timers: While time

    Timers: While time values usually cannot be reduced in the target system, their usage can be encapsulated as an abstraction which can be replaced easily (e.g., by a non-deterministic choice) during model checking.

  • Q : Explain Dynamic Language Runtime

    Explain Dynamic Language Runtime (DLR) briefly?

    		•
  • Q : "Const" qualifier for pointers and

    In C++ an arguments to a function can be declared as constant as shown below:

    Q : What is Universal Character Set or UTF

    UTF: Universal Character Set (abbreviated as UCS) Transformation Format. The format for symbolizing multibyte characters which is compatible with programs and file systems which were only made to handle single byte characters.

    		•
  • Q : Advantage of wrapping database calls in

    What is the advantage of wrapping database calls in MTS transactions?

    		•
  • Q : Define the term Sound card Define the

    Define the term Sound card: It is a hardware device employed to turn digital data into sound.

    		•
  • Q : Define Factoring Problem Factoring

    Factoring Problem: Factoring is the action of dividing an integer into a set of smaller integers (or factors) which, when multiplied altogether, form the unique integer. For illustration, the factors of 15 are 3 and 5; the factoring trouble is to find

    		•
  • Q : Explain For loop For loop : This is one

    For loop: This is one of the Java's three control structures employed for looping. The other two are while loop and do loop. A for loop includes of a loop header and a loop body. The header comprises of three expressions separated by two semicolons an

    		•