28 lines
1008 B
Scala
28 lines
1008 B
Scala
import java.io.File
|
|
import java.util.Scanner
|
|
import java.util.regex.Pattern
|
|
|
|
object CommatizingNumbers extends App {
|
|
|
|
def commatize(s: String): Unit = commatize(s, 0, 3, ",")
|
|
|
|
def commatize(s: String, start: Int, step: Int, ins: String): Unit = {
|
|
if (start >= 0 && start <= s.length && step >= 1 && step <= s.length) {
|
|
val m = Pattern.compile("([1-9][0-9]*)").matcher(s.substring(start))
|
|
val result = new StringBuffer(s.substring(0, start))
|
|
if (m.find) {
|
|
val sb = new StringBuilder(m.group(1)).reverse
|
|
for (i <- step until sb.length by step) sb.insert(i, ins)
|
|
m.appendReplacement(result, sb.reverse.toString)
|
|
}
|
|
println(m.appendTail(result))
|
|
}
|
|
}
|
|
|
|
commatize("pi=3.14159265358979323846264338327950288419716939937510582" + "097494459231", 6, 5, " ")
|
|
commatize("The author has two Z$100000000000000 Zimbabwe notes (100 " + "trillion).", 0, 3, ".")
|
|
|
|
val sc = new Scanner(new File("input.txt"))
|
|
while (sc.hasNext) commatize(sc.nextLine)
|
|
}
|