double pointer in c
Double Pointer in C
In C, a double pointer is a pointer that points to another pointer. It is also known as a pointer to a pointer.
Here is an example of how a double pointer can be declared and used in C:
#include <stdio.h>
int main() {
int num = 10;
int *ptr = # // pointer to an integer
int doublePtr = &ptr; // double pointer
printf("Value of num: %d\n", num);
printf("Value of ptr: %d\n", ptr);
printf("Value of doublePtr: %d\n", doublePtr);
return 0;
}
In the above example, we have a variable num
of type int
. We declare a pointer ptr
that points to the memory address of num
. Then, we declare a double pointer doublePtr
that points to the memory address of ptr
.
To access the value of num
using the double pointer, we use the operator. The expression
doublePtr
gives us the value of num
.
Output:
Value of num: 10
Value of *ptr: 10
Value of doublePtr: 10
This is a basic example to demonstrate the concept of a double pointer in C. Double pointers are commonly used in scenarios where we need to modify the value of a pointer itself or pass a pointer to a function by reference.