Pointer

Go has pointers. A pointer holds the memory address of a value.

The type *T is a pointer to a T value. Its zero value is nil.

var p *int

The & operator generates a pointer to its operand.

i := 42

p = &i

The * operator denotes the pointer's underlying value.

fmt.Println(*p) // read i through the pointer p

*p = 21 // set i through the pointer p

This is known as "dereferencing" or "indirecting".

Unlike C, Go has no pointer arithmetic.

package main

import "fmt"

func main() {

i, j := 42, 2701

p := &i // point to i

fmt.Println(*p) // read i through the pointer

*p = 21 // set i through the pointer

fmt.Println(i) // see the new value of i

p = &j // point to j

*p = *p / 37 // divide j through the pointer

fmt.Println(j) // see the new value of j

}