--%>
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 the term Statement terminator

    Define the term Statement terminator: The semicolon (;) is employed to point out the end of a statement.

    		•
  • Q : Describe tri-state devices Describe the

    Describe the tri-state devices and explain why they are necessary in a bus oriented system?

    		•
  • Q : Compute the Total Shopper Spending in

    Most of the reports produced from the system compute the total dollars in purchases for a shopper. Process the following steps to build a function named TOT_PURCH_SF which accepts a shopper id as input and returns the total dollars which the shopper has spent with com

    		•
  • 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 : Define the term Mutual recursion Define

    Define the term Mutual recursion: Recursion which outcomes from two methods calling one other recursively.

    		•
  • Q : Define Octal Octal : Number

    Octal: Number representation of octal is base 8. In base 8, simply the digits 0 to 7 are employed. Digit positions symbolize successive powers of 8.

    		•
  • Q : Define the term Heterogeneous collection

    Define the term Heterogeneous collection: It is a collection of objects with distinct dynamic types

    		•
  • Q : Define class Define class?

    Define class?

    		•
  • Q : Explain script recorded over tested web

    Why is the script recorded over the tested web pages not playback correctly?

    		•
  • Q : Explain Information hiding Information

    Information hiding: The practice of making sure that only as much information is exposed regarding the implementation of a class as is strictly needed. Hiding needless knowledge of implementation makes it not as much of likely that other classes will

    		•