diff options
| -rw-r--r-- | factors/factors_test.go | 17 | ||||
| -rw-r--r-- | factors/score.go | 39 | ||||
| -rw-r--r-- | radix_info.go | 1 |
3 files changed, 57 insertions, 0 deletions
diff --git a/factors/factors_test.go b/factors/factors_test.go index ceaf4d1..f14dd31 100644 --- a/factors/factors_test.go +++ b/factors/factors_test.go @@ -105,6 +105,23 @@ func TestFactorScore(t *testing.T) { } } +var basicRankCases = map[uint]string{ + 2: "D-", 3: "E-", 4: "C~", 5: "F+", 6: "B~", + 7: "F-", 8: "C-", 9: "E~", 10: "D+", 11: "F~", 12: "A-", + 14: "D~", 15: "E+", 18: "B-", 20: "C+", 24: "A~", 30: "B+", 60: "A+", +} + +func TestBasicRank (t *testing.T) { + for i, expected := range basicRankCases { + t.Run(fmt.Sprintf("%d", i), func(t *testing.T) { + actual := BasicRank(i) + if expected != actual { + t.Errorf("BasicRank(%d) = %s, want %s", i, actual, expected) + } + }) + } +} + func mapEquals[K comparable, V comparable](a, b map[K]V) bool { for k := range a { if a[k] != b[k] { diff --git a/factors/score.go b/factors/score.go index 707120d..b47aac4 100644 --- a/factors/score.go +++ b/factors/score.go @@ -26,3 +26,42 @@ func Score(n uint) float64 { } return float64(factorSum) / float64(n) } + +// BasicRank returns a rank describing how well a base handles the simplest +// fractions (1/2, 1/3, 1/4 and 1/5) +// also known as 2345 Rank +func BasicRank(n uint) string { + var firstRank, secondRank string + if n%2 == 0 { + if n%3 == 0 { + if n%4 == 0 { + firstRank = "A" + } else { + firstRank = "B" + } + } else { + if n%4 == 0 { + firstRank = "C" + } else { + firstRank = "D" + } + } + } else { + if n%3 == 0 { + firstRank = "E" + } else { + firstRank = "F" + } + } + + switch n % 5 { + case 0: + secondRank = "+" + case 1, 4: + secondRank = "~" + case 2, 3: + secondRank = "-" + } + + return firstRank + secondRank +} diff --git a/radix_info.go b/radix_info.go index 4194a2c..3e83aad 100644 --- a/radix_info.go +++ b/radix_info.go @@ -22,6 +22,7 @@ func main() { fmt.Printf("Factors: %v (Score: %.2f)\n", n_factors, factorScore) fmt.Printf("Totative Ratio: %03.1f%%\n", factors.TotativeRatio(n)*100.0) + fmt.Printf("2345 Rank: %s\n", factors.BasicRank(n)) } else { fmt.Println("Argument must be an integer above 1.") } |