auctionsim/main/main.go

package main

import (
	"fmt"
	"log"
	"os"
	"strconv"
	"git.chromaticdragon.app/kistaro/auctionsim/auctionsim"
)

func main() {
	num := 1000
	if len(os.Args) > 1 {
		n, err := strconv.ParseInt(os.Args[1], 0, 64)
		if err != nil {
			log.Fatalf("can't parse %q as a number of bidders: %v", os.Args[1], err)
		}
		num = n
	}
	if num <= 1 {
		log.Fatalf("can't run an auction with %d bidders", num)
	}

	price, bidder := auctionsim.RunAuction(
		auctionsim.CappedBidderGenerator{
			G: auctionsim.NormalestBidderGenerator(),
			Lim: num,
		},
	)

	delta := bidder.Value - price
	valueStr := "gaining nothing"
	if delta > 0 {
		valueStr = fmt.Sprintf("gaining ¤%f", delta)
	}
	if delta < 0 {
		valueStr = fmt.Sprintf("losing ¤%f", -delta)
	}

	fmt.Printf("The auction winner paid ¤%f, %s.\n", price, valueStr)
	fmt.Printf("The item was worth ¤%f to them.\n", bidder.Value)
	fmt.Printf("They would have paid up to ¤%f for it.\n", bidder.BidCeiling())
}