--%>
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 Synchronized statement

    Synchronized statement: It is a statement in which an object-lock should be obtained for the target object prior to the body of the statement and can be entered. Employed to enclose a critical section in order to save a race hazard.

    		•
  • Q : Explain the good illustrations of

    Explain the good illustrations of closing XHTML elements.

    		•
  • Q : Throughout system testing the

    Someone complains that throughout system testing the application frequently crashes. What probable process problem does which indicate?

    		•
  • Q : What is an Anonymous class Anonymous

    Anonymous class: It is a class formed without a class name. Such a class will be a sub class or an implementation of an interface, and is generally formed as an actual argument or returned as a method outcome. For example:

    Q : Explain Throw statement Throw statement

    Throw statement: It is a statement employed to throw an exception. For example:     throw new IndexOutOfBoundsException(i+" is too large.");

    		•
  • Q : Define Finally clause Finally clause :

    Finally clause: This is a part of try statement which is always executed, either subsequent the handling of caught exception, and normal termination of the protected statements.

    		•
  • Q : Describe Real number Real number : It

    Real number: It is a number with an integer and a fractional portion. The primitive types double and float are employed to symbolize real numbers.

    		•
  • Q : What is Native method Native method :

    Native method: In native method, the method is written in a language other than Java, however accessible to a Java program. Native methods are far away from the scope of this definition.

    		•
  • Q : Write a recursive function intpower(base

    Write a recursive function intpower(base, exponent) that when invoked returns base^exponent. For example, intpower(3,4) = 3*3*3*3. Assume that the exponent is an integer greater than or equal to 1.

  • Q : Explain the good example of XHTML

    Explain the good example of XHTML element opening tags.

    		•