pointers in cpp

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showing results for - "pointers in cpp"
Yannik
12 Mar 2019
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}
Vince
08 Jul 2017
1int myvar = 6;
2int pointer = &myvar; // adress of myvar
3int value = *pointer; // the value the pointer points to: 6
Liberty
08 May 2018
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}
Lena
12 Jun 2019
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.
Tymeo
03 Aug 2019
1void one() { cout << "One\n"; }
2void two() { cout << "Two\n"; }
3
4
5int main()
6{
7	void (*fptr)(); //Declare a function pointer to voids with no params
8
9	fptr = &one; //fptr -> one
10	*fptr(); //=> one()
11
12	fptr = &two; //fptr -> two
13	*fptr(); //=> two()
14
15	return 0;
16}
17
Alonso
09 May 2017
1#include <iostream>
2using std::cout;
3
4int main() {
5  /* 
6  Some things to keep in mind:
7  	-you shouldn't circumvent the type system if you are creating raw ptrs
8  	and don't need to "type pun" or cast (don't use void ptrs)
9    -ptr types only reference memory (which are integers), not actual data, thus
10    they should not be treated as data types
11    char* is just 1 byte of mem, int* is just 4 bytes of mem, etc
12    - '*' means that you are creating a pointer which "points" to the mem address
13    of a variable
14    - '&', in this case, means "get the mem address of this variable"
15  */
16  
17  void* ptr; // a pointer that doesn't reference a certain size of memory
18  int* int_ptr; // a pointer that points to data with
19  				// only 4 bytes of memory (on stack)
20  
21  int a = 5; // allocates 4 bytes of mem and stores "5" there (as a primitive)
22  ptr = &a; // can only access the memory address of 'a' (not the data there)
23  
24  int b = 45; 
25  int_ptr = &b; // can access both memory address and data of 'b'
26  
27  cout << ptr << "\n"; // prints mem address of 'a'
28  /*cout << *ptr << "\n"; <- this will error out; a void ptr cannot be 
29  							 derefrenced */
30  cout << *(int*)ptr << "\n"; // type punning to get around void ptr (extra work)
31  
32  cout << int_ptr << "\n"; // mem address of b
33  cout << *int_ptr << "\n"; // data stored at b
34  
35  /* -- OUTPUTS -- */
36  /*
37  	some memory address (arbitrary) which contains 05 00 00 00 as its data
38  	5
39    some memory address (arbitrary) which contains 2D 00 00 00 as its data
40    45
41  */
42  
43  return 0; // you only need this if "main" isnt the linker entry point
44  			// you also don't care
45  
46  // ur also probably wondering why I didn't using namespace std... cherno
47}
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