pionter in c++
#include <iostream>
using namespace std;
int main(){
//Pointer declaration
int *p, var=101;
//Assignment
p = &var;
cout<<"Address of var: "<<&var<<endl;
cout<<"Address of var: "<<p<<endl;
cout<<"Address of p: "<<&p<<endl;
cout<<"Value of var: "<<*p;
return 0;
}pointer c++
int myvar = 6;
int pointer = &myvar; // adress of myvar
int value = *pointer; // the value the pointer points to: 6c++ pointers
#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; //Prints "20"
// print the address stored in ip pointer variable
cout << "Address stored in ip variable: ";
cout << ip << endl; //Prints "b7f8yufs78fds"
// access the value at the address available in pointer
cout << "Value of *ip variable: ";
cout << *ip << endl; //Prints "20"
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.Function pointer C++
void one() { cout << "One\n"; }
void two() { cout << "Two\n"; }
int main()
{
void (*fptr)(); //Declare a function pointer to voids with no params
fptr = &one; //fptr -> one
*fptr(); //=> one()
fptr = &two; //fptr -> two
*fptr(); //=> two()
return 0;
}pointers in c++
void simple_pointer_examples() {
int a; // a can contain an integer
int* x; // x can contain the memory address of an integer.
char* y; // y can contain the memory address of a char.
Foo* z; // z can contain the memory address of a Foo object.
a = 10;
x = &a; // '&a' extracts address of a
std::cout << x << std::endl; // memory address of a => 0x7ffe9e25bffc
std::cout << *x << std::endl; // value of a => 10
}Copyright © 2021 Codeinu
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