How do you dereference a double pointer in C++?
1 Answer
- x is a pointer to a pointer to int.
- *x yields a int* (pointer to int )
- **x = is like *(*x) = so you first obtain the pointer to int then by dereferencing you are able to set the value at the address.
Can a pointer be double?
So, when we define a pointer to pointer. The first pointer is used to store the address of the variable. And the second pointer is used to store the address of the first pointer. That is why they are also known as double pointers.
How do you access the elements of a 2D array using pointers?
Pointers and two dimensional Arrays: In a two dimensional array, we can access each element by using two subscripts, where first subscript represents the row number and second subscript represents the column number. The elements of 2-D array can be accessed with the help of pointer notation also.
Why do we use double pointer?
Double pointers can also be used when we want to alter or change the value of the pointer. In general double pointers are used if we want to store or reserve the memory allocation or assignment even outside of a function call we can do it using double pointer by just passing these functions with ** arg.
Why double pointer is used?
How do I point a pointer to another pointer?
Pointer assignment between two pointers makes them point to the same pointee. So the assignment y = x; makes y point to the same pointee as x . Pointer assignment does not touch the pointees. It just changes one pointer to have the same reference as another pointer.
How can a pointer be used to access individual elements of an array?
Access Array Elements Using Pointers In this program, the elements are stored in the integer array data[] . Then, the elements of the array are accessed using the pointer notation. By the way, data[0] is equivalent to *data and &data[0] is equivalent to data.