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: 6
c++ 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.
c++ pointers
#include <iostream> using namespace std; // isualize this on http://pythontutor.com/cpp.html#mode=edit int main() { double* account_pointer = new double; *account_pointer = 1000; cout << "Allocated one new variable containing " << *account_pointer << endl; cout << endl; int n = 10; double* account_array = new double[n]; for (int i = 0; i < n; i++) { account_array[i] = 1000 * i; } cout << "Allocated an array of size " << n << endl; for (int i = 0; i < n; i++) { cout << i << ": " << account_array[i] << endl; } cout << endl; // Doubling the array capacity double* bigger_array = new double[2 * n]; for (int i = 0; i < n; i++) { bigger_array[i] = account_array[i]; } delete[] account_array; // Deleting smaller array account_array = bigger_array; n = 2 * n; cout << "Now there is room for an additional element:" << endl; account_array[10] = 10000; cout << 10 << ": " << account_array[10] << endl; delete account_pointer; delete[] account_array; // Deleting larger array return 0; }
c++ pointers
// my first pointer #include <iostream> using namespace std; int main () { int firstvalue, secondvalue; int * mypointer; //creates pointer variable of type int mypointer = &firstvalue; *mypointer = 10; mypointer = &secondvalue; *mypointer = 20; cout << "firstvalue is " << firstvalue << '\n'; //firstvalue is 10 cout << "secondvalue is " << secondvalue << '\n'; //secondvalue is 20 return 0; }
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