Memory management operator, C/C++ Programming

Memory Management Operator

In C malloc( ), calloc( ), realloc( ), and free( ) are used to mange dynamic memory.  In

addition to these function C++ have derived two unary operators new and delete to perform dynamic allocation of memory.   An object or variable may be created or destroyed by using these functions.  The syntax for to create a dynamic memory allocation is

pointer_variable = new data_type;

 

int *p;

p = new int;

The above two statements can be written in one stroke or line. int *p = new int;

*p = 25; Assigning 25 through pointer

 

It can also be initialized in one stroke or line. The syntax to initialize the new operator is:

pointer_variable = new data_type (value);

int *p = new int(25);

 

The new operator can also be used in array

int *pa = new int[10];  This will create memory space for 10 integers the first element is

referred as p[0].....p[9];

 

When using multi dimension arrays all the array sizes must be specified, the first array may be variable the remaining must be constants.

pm = new int[N][3][3];

To release the memory the syntax is delete pointer_variable;

delete p; will release the memory stored by the pointer variable p. delete [ ]pa; will release dynamically allocated array.

Manipulators:

The most widely used manipulators are endl and setw.

 

cout <<"This is C++ program"<< endl; The endl work just like "\n"

 

The setw operator is used to specify the width of the output.  It is similar to %wd, %w.pf in C. The default is right justified

int x=10, y=1000;

cout<

 

 

Posted Date: 9/20/2012 7:37:24 AM | Location : United States







Related Discussions:- Memory management operator, Assignment Help, Ask Question on Memory management operator, Get Answer, Expert's Help, Memory management operator Discussions

Write discussion on Memory management operator
Your posts are moderated
Related Questions
my program does not run more than 9 iterations when ever i want to iterate more than 100 iterations. what is the reason and how to tackle?

Q: How can one encourage his (older) compiler to check new to see automatically if it returns NULL?       A: His compiler eventually will. If he contain an old compiler wh

Problem: (a) A GUI can contain text-fields, buttons, and other labels. A button usually triggers an event on the GUI. Explain the different processes in registering an event

.write a program that counts the number of occurrences of the string in the n-th padovan string p(n)   program in java // aakash , suraj , prem sasi kumar kamaraj college

example of program to ad two numbers

E v o l u t i o n of Software: In the past stage of programming the software's were developed in Machine language Using binary numbers 1's and 0's.  Later it convert

write a program to find the minimum number of shelves

luminous jewel polishing necklace, c/c++ programming

The program reads two numbers and a character (operator). If the character is "+" then sum is displayed. If it is "-"then difference is displayed. If it is "*" then product is disp

Binary logical bit-wise operators  There are three logical bit-wise operators :                   &             and                 |              or