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state.go
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package state
import (
"fmt"
"log"
)
type state interface {
addItem(int) error
requestItem() error
insertMoney(money int) error
dispenseItem() error
}
func main() {
vendingMachine := newVendingMachine(1, 10)
err := vendingMachine.requestItem()
if err != nil {
log.Fatalf(err.Error())
}
err = vendingMachine.insertMoney(10)
if err != nil {
log.Fatalf(err.Error())
}
err = vendingMachine.dispenseItem()
if err != nil {
log.Fatalf(err.Error())
}
fmt.Println()
err = vendingMachine.addItem(2)
if err != nil {
log.Fatalf(err.Error())
}
fmt.Println()
err = vendingMachine.requestItem()
if err != nil {
log.Fatalf(err.Error())
}
err = vendingMachine.insertMoney(10)
if err != nil {
log.Fatalf(err.Error())
}
err = vendingMachine.dispenseItem()
if err != nil {
log.Fatalf(err.Error())
}
}