pointer c++
int myvar = 6;
int pointer = &myvar; // adress of myvar
int value = *pointer; // the value the pointer points to: 6
pointer c++
int myvar = 6;
int pointer = &myvar; // adress of myvar
int value = *pointer; // the value the pointer points to: 6
pointer in c++
// Variable is used to store value
int a = 5;
cout << a; //output is 5
// Pointer is used to store address of variable
int a = 5;
int *ab;
ab = &a; //& is used get address of the variable
cout << ab; // Output is address of variable
c++ pointer
#include <iostream>
void pointers_with_dynamic_memory() {
int arr_size; // arr_size can contain an integer
int* x; // x can contain the memory address of an integer.
std::cout << "enter an integer > 0: ";
std::cin >> arr_size;
// value of x is the starting address of a heap-allocated block ints
x = new int[arr_size];
x[0] = 10; // set first element of array to 10
*x = 50; // set first element of array to 50
*(x + 1) = 100; // +1 offsets automatically by the value of sizeof(int)
delete [] x;
}
pointers c++
// pointer to functions
#include <iostream>
using namespace std;
int addition (int a, int b)
{ return (a+b); }
int subtraction (int a, int b)
{ return (a-b); }
int operation (int x, int y, int (*functocall)(int,int))
{
int g;
g = (*functocall)(x,y);
return (g);
}
int main ()
{
int m,n;
int (*minus)(int,int) = subtraction;
m = operation (7, 5, addition);
n = operation (20, m, minus);
cout <<n;
return 0;
}
what is this pointer in c++
Every object in C++ has access to its own address through an important pointer called this pointer.
The this pointer is an implicit parameter to all member functions.
Therefore, inside a member function,
this may be used to refer to the invoking object.
Friend functions do not have a this pointer,
because friends are not members of a class.
Only member functions have a this pointer.
pointer in c++
int* pointVar, var;
var = 5;
// assign address of var to pointVar
pointVar = &var;
// access value pointed by pointVar
cout << *pointVar << endl; // Output: 5
In the above code, the address of var is assigned to the pointVar pointer.
We have used the *pointVar to get the value stored in that address.
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