Which of the following is NOT a method of the io.Writer interface in Go?

What is the output of the following code snippet?

package main

import "fmt"

func main() {

   x := []int{1, 2, 3}

   y := &x

   fmt.Println((*y)[0])

}

What is the output of the following Go code?

package main

import "fmt"

func change(p *int) {

   *p = 20

}

func main() {

   x := 10

   p := &x

   change(p)

   fmt.Println(x)

}

What is the output of the following Go code?

package main

import "fmt"

func main() {

   x := 10

   p := &x

   fmt.Println(*p)

   *p = 20

   fmt.Println(x)

}

What is the output of the following code snippet?

package main

import "fmt"

func main() {

   x := 5

   y := &x

   fmt.Println(y)

}

What is the output of the following code?

package main

import "fmt"

func main() {

   var ptr *int

   var num int = 10

   ptr = &num

   fmt.Printf("Value of ptr: %d\n", *ptr)

}

What is the output of the following Go code?

package main

import "fmt"

func change(p *int) {

   *p = *p + 10

}

func main() {

   x := 10

   p := &x

   fmt.Println(*p)

   change(p)

   fmt.Println(*p)

}

What is the output of the following Go code?

package main

import "fmt"

func swap(p, q *int) {

   *p, *q = *q, *p

}

func main() {

   x := 10

   y := 20

   p := &x

   q := &y

   swap(p, q)

   fmt.Println(x, y)

}

Which of the following statements is true about the fmt.Stringer interface in Go?

What is the purpose of the sort.Interface interface in Go?