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Commatizing numbers: Difference between revisions
Scala contribution added.
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(Scala contribution added.) |
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Line 811:
return _</lang>
'''output''' when using the internal strings for input:
<pre>before──►pi=3.14159265358979323846264338327950288419716939937510582097494459231▼
▲before──►pi=3.14159265358979323846264338327950288419716939937510582097494459231
after──►pi=3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59231
Line 843 ⟶ 842:
before──►6/9/1946 was a good year for some.
after──►6/9/1946 was a good year for some.</pre>
=={{header|Scala}}==
===Java-ish version===
<lang 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)
}</lang>
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