--%>
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 : Implementation of XML Web Services

    Explain the implementation of XML Web Services to be found in .NET. In particular, explain the role of the wsdl.exe tool.

    		•
  • Q : Explain Operating system Operating

    Operating system: The operating system permits a computer's hardware devices to be accessed by the programs. For example, it permits data to be managed on a computer's disks in the form of a file system and it delivers the co-ordinate positions of a m

    		•
  • Q : Define Checked exception Checked

    Checked exception: An exception which should be caught locally in the try statement, or propagated through a throws clause stated in the method header.

    		•
  • Q : Message and method in programming

    Illustrate the basic difference between the message and method in programming?

    		•
  • Q : Double clock signal in synchronous

    Describes the cases where you need to double clock a signal before presenting this to a synchronous state machine?

    		•
  • Q : Define the term Module Module : It is a

    Module: It is a group of program components, usually with restricted visibility to program components in other modules. Java employs packages to implement this perception.

    		•
  • Q : Define Class Class : It is a

    Class: It is a programming language concept which permits data and techniques to be grouped altogether. The class concept is basic to the notion of an object-oriented programming language. Methods of a class define the set of permitte

    		•
  • Q : Define Property Specifications Property

    Property Specifications: Users can specify assertions using the assert(expr) statements. An assert statement is used to check if the property specified by the expression expr is valid within a state. If expr evaluates to 0, this implies that it is not

    		•
  • Q : Define the term Class constant Define

    Define the term Class constant: A variable which is defined as both final and static.

    		•
  • Q : What is an IP address IP address : An

    IP address: An Internet Protocol (abbreviated as IP) address for a networked computer. Presently, IP addresses comprises of 4-byte values, written in dotted decimal notation, like 129.12.0.1. In future, IP addresses will be 16-bytes long to accommodat

    		•