Note in Go Pointers

pointer.go

package main

import "fmt"

func main() {
  var address0 *int
  var number int
  number = 32
  address0 = &number
  fmt.Println("Address ::", address0, "Value", number)

  number = 72
  fmt.Println("Address ::", address0, "Value", number)

  address1 := &number
  fmt.Println("Address ::", address0, "Value", *address1)

  *address0 = 88
  fmt.Println("Address ::", address0, "Value", *address1)

  number = 10000
  fmt.Println("Address ::", address0, "Value", *address1)

  fmt.Println("ARE THEY THE SAME?", address0 == address1)

}

pointer.md

Pointer

This is my note of using Go pointer; how it made, how to utilize it, and what kind of common case we encounter a pointer. First note is how pointer created in Go. ✓

var mem_add *dtype

Star notation (*) used to mark a variable that it is a pointer; it only contain certain memory address. Pointer need data type (dtype). Assigning different data type to a memory address with different data type will cause an error.

address0 = &number

Ampersand notation (&) used to extract an address from a variable. In example above, we assign address0 to have memory address of variable number.

*address0 = 88

We use (*) to assign a value to a certain address.
Basic rule is . accessing memory address from a value is using ampersand line 9 . accessing value from a memory address is using star line 18

same rule is also applied when declaring