Monty Hall Problem

montyhall.go

package main

import (
	"fmt"
	"math/rand"
)

const doors = 3
const trials = 10000
const seed = 15

func main() {
	unchanged_count := 0
	changed_count := 0
	rand.Seed(seed)
	for i := 0; i < trials; i++ {
		// Here is the car
		answer := rand.Intn(doors)
		// First guess by the attendee
		first_guess := rand.Intn(doors)
		// Hint from the host
		hinted := first_guess
		for hinted == answer || hinted == first_guess {
			hinted = rand.Intn(doors)
		}
		// Changed guess
		second_guess := first_guess
		for second_guess == first_guess || second_guess == hinted {
			second_guess = rand.Intn(doors)
		}
		// Check
		if first_guess == answer {
			unchanged_count++
		}
		if second_guess == answer {
			changed_count++
		}
//		fmt.Printf("First: %v, Second: %v\n", first_guess == answer, second_guess == answer)
	}
	fmt.Printf("Changed wins: %v, Unchanged wins: %v\n", changed_count, unchanged_count)
}