YouTipGo Pointer To Pointer
# Go Language Pointer to Pointer
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If a pointer variable stores the address of another pointer variable, it is called 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:
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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, you need to use two `*` signs, as shown below:
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 /* Get the value of pptr */ fmt.Printf("Variable a = %dn", a ) fmt.Printf("Pointer variable *ptr = %dn", *ptr ) fmt.Printf("Pointer to pointer variable **pptr = %dn", **pptr)}
The output of the above example is:
Variable a = 3000Pointer variable *ptr = 3000Pointer to pointer variable **pptr = 3000
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