Question

Explain what each line of the following snippet of code does:

int *ptr;
ptr = new int;
*ptr = 10;
cout << ptr << ' ' << &ptr << ' ' << *ptr;
delete ptr;
cout << ptr << ' ' << &ptr << ' ' << *ptr;

Answer 1

//declaring a pointer
int *ptr;

//assigning memory for the pointer variable
ptr = new int;

//Assigning value to the memory address sored in the ptr variable
*ptr = 10;

//printing the value of ptr
//then printing the address of ptr
//then printing the value of address stored in ptr
cout << ptr << ' ' << &ptr << ' ' << *ptr;

//delete ptr
delete ptr;

//printing the value of ptr
//then printing the address of ptr
//then printing the value of address stored in ptr
cout << ptr << ' ' << &ptr << ' ' << *ptr;