C++ Programming Code Examples

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Pointers in C++ Programming Language

Pointers in C++ Language

The pointer in C++ language is a variable, it is also known as locator or indicator that points to an address of a value. In C++, a pointer refers to a variable that holds the address of another variable. Like regular variables, pointers have a data type. For example, a pointer of type integer can hold the address of a variable of type integer. A pointer of character type can hold the address of a variable of character type. You should see a pointer as a symbolic representation of a memory address. With pointers, programs can simulate call-by-reference. They can also create and manipulate dynamic data structures. In C++, a pointer variable refers to a variable pointing to a specific address in a memory pointed by another variable.

Syntax for Pointers in C++

int *ip; // pointer to an integer double *dp; // pointer to a double float *fp; // pointer to a float char *ch // pointer to character

• Pointer reduces the code and improves the performance, it is used to retrieving strings, trees etc. and used with arrays, structures and functions. • We can return multiple values from function using pointer. • It makes you able to access any memory location in the computer's memory. Dynamic memory allocation: In c language, we can dynamically allocate memory using malloc() and calloc() functions where pointer is used. Arrays, Functions and Structures: Pointers in C language are widely used in arrays, functions and structures. It reduces the code and improves the performance. & (ampersand sign): Address operator - Determine the address of a variable. * (asterisk sign): Indirection operator - Access the value of an address. The pointer in C++ language can be declared using * (asterisk symbol).

/* pointer is a variable in C++ that holds the address of another variable */ #include <iostream> using namespace std; int main () { int var = 20; // actual variable declaration. int *ip; // pointer variable ip = &var; // store address of var in pointer variable cout << "Value of var variable: "; cout << var << endl; // print the address stored in ip pointer variable cout << "Address stored in ip variable: "; cout << ip << endl; // access the value at the address available in pointer cout << "Value of *ip variable: "; cout << *ip << endl; return 0; }

Uses parts inventory to demonstrate structures

Insert one vector into another using an insert iterator

C++ Using The If Else Ladder Else If Clause

The "expressions" are evaluated in order; if an expressionis true, the 'statement' or 'block of statement' associated with it is executed, and this terminates the whole chain. The Code for

Program to Check String is Palindrome or not in C++

MemoryCell class implementation

program in C++ to check if a number is Keith or not.

Check status: EOF encountered, Non-Fatal I/O error, Fatal I/O error

C++ Wheel Sieve Generate Prime Number

This is a C++ Program to find 'Prime number' between the given range using 'Wheel Seive' method. "Wheel Factorization" is a graphical method for manually performing preliminary

Compute area of a rectangle using default arguments.

Catch exception from a function

Demonstrate raw storage iterators

Slice a valarray