If a pointer variable holds the address of another pointer variable, the pointer variable is called a pointer variable that points to the pointer.
When defining a pointer variable that points to a pointer, the first pointerstores the address of the second pointer, and the second pointer stores theaddress of the variable:
The pointer variable declaration to the pointer is in the following format:
var ptr **int; The pointer variable to the pointer above is an integer.
Accessing the value of a pointer variable pointing to a pointer requires theuse of two * number, as follows:
package main import "fmt" func main() { var a int var ptr *int var pptr **int a = 3000 /* Pointer ptr address */ ptr = &a /* Pointing to pointer ptr address */ pptr = &ptr /* Obtain the value of pptr */ fmt.Printf("Variable a= %d\n", a ) fmt.Printf("Pointer variable * ptr = %d\n", *ptr ) fmt.Printf("Pointer variable pointing to a pointer **pptr = %d\n", **pptr) } The output of the above example is as follows:
Variable a= 3000 pointer variable *ptr = 3000 Pointer variable pointing to a pointer **pptr = 3000