Go Pointers

var p *int

i := 42
p = &i

fmt.Println(*p) // read i through the pointer p
*p = 21         // set i through the pointer p

package main

import "fmt"

func main() {
   var actualVariableFirstName string = "Jhon"   /* variable declaration */
   var pointerVariable *string      /* pointer variable declaration */

/* store address of actual variable in pointer variable*/	
   pointerVariable = &actualVariableFirstName

   fmt.Printf("\nAddress of variable: %v", &actualVariableFirstName)
   fmt.Printf("\nAddress stored in pointer variable: %v", pointerVariable)
   
   fmt.Printf("\nValue of Actual Variable: %s",actualVariableFirstName)
   fmt.Printf("\nValue of Pointer variable: %s",*pointerVariable)
   
}

package main

import "fmt"

func zeroval(ival int) {
    ival = 0
}

func zeroptr(iptr *int) {
    *iptr = 0
}

func main() {
    i := 1
    fmt.Println("initial:", i)

    zeroval(i)
    fmt.Println("zeroval:", i)

    zeroptr(&i)
    fmt.Println("zeroptr:", i)

    fmt.Println("pointer:", &i)
}