What's wrong in this code???

Question

package main

import "fmt"
//passing pointer to function
/*func age(num int){
num=25
}
func age_year(year*int){
*year=2
}

func main() {
x:=8
age(x)
fmt.Println(x)
age_year (&x)
fmt. Println (x)
}*/
func change(value int){
value=35
}
func change_ptr(ptr *int){
*ptr=87
}
func main(){
x:=54
change(x)
fmt. Println(x)
change_ptr (&x)
fmt. Println (x)
}

Answer 1

Thank you

Answer 2

What's wrong?
Both codes are working.