Pointer is a variable which holds the memory information(address) of another variable.

• Pointers helps in dynamic memory management.
• Improves execution time.
• Pointers pass reference to a variable instead of passing a copy of the variable which helps in reduction of memory usage.

Syntax

var pointername *datatype;

Example : 1

package main
import "fmt"

func main() {
    num := 10;     
    var ptr *int;   // pointer variable

    ptr = #

   fmt.Println("Value of the variable: ", *ptr);

   fmt.Println("Value at the address: ", ptr);

}

Check result here

Example : 2

package main
import "fmt"

func main() {

x := 10;     
var ptr *int;   // pointer variable

/* ptr = x; // Error because ptr is address and x is value

*ptr = &x;  // Error because &x is address and *ptr is value  */

ptr = &x; // valid because &x and ptr are addresses

*ptr = x; // valid because both x and *ptr values 

fmt.Println("Value of *ptr: ", *ptr);
fmt.Println("Value of &x: ", &x);
fmt.Println("Value of ptr: ", ptr);
fmt.Println("Value of x: ", x);
}

Check result here