Clean up project

This commit is contained in:
Steven Polley 2020-11-14 20:12:11 -07:00
parent 06d7ff4586
commit 56f3a5ed3a
2 changed files with 15 additions and 9 deletions

2
.gitignore vendored Normal file
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@ -0,0 +1,2 @@
benfords-law
benfords-law.exe

22
main.go
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@ -11,20 +11,22 @@ import (
)
const (
randomMin = 0
randomMin = 1 // We specify a range which random numbers will be generated, we must start at the first possible left-most digit
randomMax = 999999999999999999 // int64 max value is 9223372036854775807. We use one digit less than that with all 9's in order to not give bias to any digits.
numSamples = 100000000 // A nice rounded human number
numSamples = 100000000 // A nice rounded human number
)
func main() {
results := [9]int{} // There are 9 possible leading digits and 0 does not count, offset by 1 for index to actual value. Examples: To access 1 use [0]. To access 5 use [4]. To access 9 use [8].
currentSample := 0
// In results, we store a count of each left most leading digits as numbers are randomly genereated
results := [9]int{} // There are 9 possible leading digits and 0 does not count, offset by 1 for index to actual value. Examples: To access count for 1 use [0]. To access 5 use [4]. To access 9 use [8].
currentSample := 0 // A counter that increments each time a random number sample has been generated. Used for status messages
// Start a little goroutine to output status and attach a ticker to execute it each second
statusTicker := time.NewTicker(time.Second)
go func() {
for {
<-statusTicker.C
<-statusTicker.C // Wait for heartbeat from ticker channel
percentCompleted := (currentSample * 100) / numSamples
log.Printf("%d%% completed generating and analyzing samples", percentCompleted)
}
@ -34,17 +36,19 @@ func main() {
rand.Seed(time.Now().UnixNano())
for currentSample = 0; currentSample < numSamples; currentSample++ {
results[firstDigit(rand.Intn(randomMax-randomMin+1)+randomMin)-1]++ // We must use Intn instead of Int because from Base10's perspective, integers cut off at a really weird spot
results[firstDigit(rand.Intn(randomMax-randomMin+1)+randomMin)-1]++ // Generate a random number between randomMin and randomMax, get the first digit then increment the counter in results array, remember, it's offset by 1
}
// Done generating and counting digits, stop the status ticker
statusTicker.Stop()
log.Printf("done.")
// output results
for digitMinusOne, count := range results {
fmt.Printf("%d: %d (%f%%)\n", digitMinusOne+1, count, float64(count*100)/float64(numSamples))
// Output results
for digitMinusOne, digitCount := range results {
fmt.Printf("%d: %d (%f%%)\n", digitMinusOne+1, digitCount, float64(digitCount*100)/float64(numSamples))
}
// Wait indefinitely until Enter Key is pressed, avoid terminating terminal before viewing results if ran from a shell
fmt.Print("Press 'Enter' to continue...")
bufio.NewReader(os.Stdin).ReadBytes('\n')
}