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Go Language Pointer to Pointer

Go Pointers

If a pointer variable stores the address of another pointer variable, it is referred to as a pointer to a pointer variable.

When defining a pointer to a pointer variable, the first pointer stores the address of the second pointer, and the second pointer stores the address of the variable:

The declaration format for a pointer to a pointer variable is as follows:

var ptr **int;

The above pointer to a pointer variable is of integer type.

To access the value of a pointer to a pointer variable, two asterisks (*) are required, as shown below:

package main

import "fmt"

func main() {

   var a int
   var ptr *int
   var pptr **int

   a = 3000

   /* Address of pointer ptr */
   ptr = &a

   /* Address of pointer to pointer ptr */
   pptr = &ptr

   /* Get the value of pptr */
   fmt.Printf("Variable a = %d\n", a )
   fmt.Printf("Pointer variable *ptr = %d\n", *ptr )
   fmt.Printf("Pointer to pointer variable **pptr = %d\n", **pptr)
}

The output of the above example is:

Variable a = 3000
Pointer variable *ptr = 3000
Pointer to pointer variable **pptr = 3000

Go Pointers

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