Simple ATM Logic in Golang

atm.go

package main

import "fmt"

type AtmValue struct {
	Val   int
	Count int
}

type ATM []AtmValue

type Result map[int]int

func main() {
	var atm ATM = ATM{
		{10, 100},
		//		{20, 80},
		{20, 1},
		{50, 50},
		{100, 10},
	}
	var amount int
	var banknoteIndex int = 3
	var result Result = make(Result)
	var atmValue AtmValue

	amount = 190

	for amount > 0 && banknoteIndex >= 0 {
		fmt.Printf("Current amount is %d. Banknote: %d\n", amount, banknoteIndex)
		atmValue = atm[banknoteIndex]
		for atmValue.Count > 0 && amount >= atmValue.Val {
			fmt.Printf("Discounting %d\n", atmValue.Val)
			amount -= atmValue.Val
			result[atmValue.Val]++
			atm[banknoteIndex].Count--
		}
		banknoteIndex--
	}
	fmt.Printf("\nMoney: %+v.\nATM: %+v\n", result, atm)
}