ELO scoring in Go

elo.go

package main

import (
	"fmt"
	"math"
)

const (
	ScoreFactor = 10
)

func main() {
	result := 1
	scoreA := 2806
	scoreB := 2577
	fmt.Printf("result: %d\nscoreA: %d\nscoreB: %d\n", result, scoreA, scoreB)
	
	scoreDiff := (float64)(scoreB - scoreA)
	expectedA := 1 / (1 + math.Pow(10, scoreDiff / 400))
	expectedB := 1 - expectedA
	fmt.Printf("scoreDiff: %f\nexpectedA: %f\nexpectedB: %f\n", scoreDiff, expectedA, expectedB)
	var resultA, resultB float64 
	switch {
	case result > 0:
		resultA = 1
		resultB = 0
	case result < 0:
		resultA = 0
		resultB = 1
	case result == 0:
		resultA = 0.5
		resultB = 0.5
	}
	fmt.Printf("resultA: %f\nresultB: %f\n", resultA, resultB)
	diffA := ScoreFactor * (resultA - expectedA)
	diffB := ScoreFactor * (resultB - expectedB)
	fmt.Printf("diffA: %f\ndiffB: %f\n", diffA, diffB)
	scoreA = (int)((float64)(scoreA) + diffA)
	scoreB = (int)((float64)(scoreB) + diffB)
	fmt.Printf("scoreA: %d\nscoreB: %d\n", scoreA, scoreB)
}