Explain the new and delete operators, C/C++ Programming

Assignment Help:

The new and delete operators

The C language has explained library functions- malloc() and free() for dynamic allocation and de-allocation of memory. C++ gives yet another approach to allocate blocks of memory - the new operator. This operator allocates memory for a given size and returns a pointer to its starting point. C++ also gives delete, to release the memory allocated by new. The pointer returned by the new operator require not be typecasted.

e.g.

                char arr[100];     // Compile_time allocation of an array

                char *arr;                             // Character pointer

arr = new char[size];                       //Run time allocation of an

                                                                //array. Size can be a

                                                                //constant or a variable.

In the above example, new returns a pointer to a block of size bytes. It is synonymous with declaring a character array. Though, declaring an array is an example of static binding - the array is built at the compile-time. This array remains in existence right from the beginning of the program to its end, even if not in use. While, the array declared by new operator can be allocated memory only when required and can be released when over with, using the delete operator. This is an example of dynamic binding.

 


Related Discussions:- Explain the new and delete operators

Define dangling pointer?, A: A dangling pointer arises while you use the ad...

A: A dangling pointer arises while you use the address of an object after its lifetime is end. It may occur in situations such as returning addresses of automatic variables from a

#coding, Smugglers are becoming very smart day by day. Now they have develo...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Big-m method, big-m method operation reseach in progrmme c++..

big-m method operation reseach in progrmme c++..

Program of conversion from basic to user-defined variable, Conversion from ...

Conversion from Basic to User-Defined variable Consider the following example. class Distance                  {                   public  :

Determine the types of container class, Determine the types of Container cl...

Determine the types of Container class Container class can be of 2 types: - Heterogeneous container - Here container class comprise a group of mixed objects - Homogeneou

Explain the different types of errors in php, Explain the different types o...

Explain the different types of errors in PHP. Warnings, Notices and Fatal errors are the types of errors in PHP Notices: Notices signifies non-critical errors, i.e. ac

Describe about the container class, Describe about the container class. ...

Describe about the container class. -Class to hold objects in external storage or memory. It acts as a generic holder. - It has a predefined behaviour and a known interface.

Define character input and output with files, Define Character Input and Ou...

Define Character Input and Output with Files? This is done by using equivalents of putchar and getchar which are called putc and getc. Each one takes an extra argument which id

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd