issue-with-%v.go

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package main

import "fmt"

type Bitcoin int

type Stringer interface {
	String() string
}

type Wallet struct {
	// lowercase means it is private
	// it is private outside the package it's defined in.
	balance Bitcoin
}

// In Go, when you call a function or a method the arguments are copied.
// so if we pass w Wallet as arg, it is just a copy not the acutal one

// this means a pointer to wallet
func (w *Wallet) Deposit(amount Bitcoin) {
	w.balance += amount
}

func (w *Wallet) Balance() Bitcoin {
	return w.balance
	// we can also write (*w).balance to dereference
	// but GO permits us to write w.balance, without an explicit dereference.
	// These pointers to structs even have their own name: struct pointers
	// and they are automatically dereferenced
}

func main() {
	wallet := Wallet{}

	wallet.Deposit(10)

	fmt.Printf("address of balance in test is %v \n", &wallet.balance)
	// it should print the memory address, howeveer it print value in the memeory address
	// need to resolve if this is acutally os specific
}