pointers c 2b 2b

1#include <iostream>
2using namespace std;
3int main(){
4   //Pointer declaration
5   int *p, var=101;
6 
7   //Assignment
8   p = &var;
9
10   cout<<"Address of var: "<<&var<<endl;
11   cout<<"Address of var: "<<p<<endl;
12   cout<<"Address of p: "<<&p<<endl;
13   cout<<"Value of var: "<<*p;
14   return 0;
15}

1int myvar = 6;
2int pointer = &myvar; // adress of myvar
3int value = *pointer; // the value the pointer points to: 6

1#include <iostream>
2
3using namespace std;
4
5int main () {
6   int  var = 20;   // actual variable declaration.
7   int  *ip;        // pointer variable 
8
9   ip = &var;       // store address of var in pointer variable
10
11   cout << "Value of var variable: "; 
12   cout << var << endl; //Prints "20"
13
14   // print the address stored in ip pointer variable
15   cout << "Address stored in ip variable: ";
16   cout << ip << endl; //Prints "b7f8yufs78fds"
17
18   // access the value at the address available in pointer
19   cout << "Value of *ip variable: ";
20   cout << *ip << endl; //Prints "20"
21
22   return 0;
23}

1Every object in C++ has access to its own address through an important pointer called this pointer.
2 The this pointer is an implicit parameter to all member functions. 
3Therefore, inside a member function,
4 this may be used to refer to the invoking object.
5
6Friend functions do not have a this pointer,
7 because friends are not members of a class. 
8Only member functions have a this pointer.

1baz = *foo;

1// pointer to functions
2#include <iostream>
3using namespace std;
4
5int addition (int a, int b)
6{ return (a+b); }
7
8int subtraction (int a, int b)
9{ return (a-b); }
10
11int operation (int x, int y, int (*functocall)(int,int))
12{
13  int g;
14  g = (*functocall)(x,y);
15  return (g);
16}
17
18int main ()
19{
20  int m,n;
21  int (*minus)(int,int) = subtraction;
22
23  m = operation (7, 5, addition);
24  n = operation (20, m, minus);
25  cout <<n;
26  return 0;
27}