Data commit

Task/Five-weekends/Kotlin/five-weekends.kotlin

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+// version 1.0.6
+
+import java.util.*
+
+fun main(args: Array<String>) {
+    val calendar = GregorianCalendar(1900, 0, 1)
+    val months31 = arrayOf(1, 3, 5, 7, 8, 10, 12)
+    val monthsWithFive = mutableListOf<String>()
+    val yearsWithNone  = mutableListOf<Int>()
+    for (year in 1900..2100) {
+        var countInYear = 0 //  counts months in a given year with 5 weekends
+        for (month in 1..12) {
+            if ((month in months31) && (Calendar.FRIDAY == calendar[Calendar.DAY_OF_WEEK])) {
+                countInYear++
+                monthsWithFive.add("%02d".format(month) + "-" + year)
+            }
+            calendar.add(Calendar.MONTH, 1)
+        }
+        if (countInYear == 0) yearsWithNone.add(year)
+    }
+    println("There are ${monthsWithFive.size} months with 5 weekends")
+    println("The first 5 are ${monthsWithFive.take(5)}")
+    println("The final 5 are ${monthsWithFive.takeLast(5)}")
+    println()
+    println("There are ${yearsWithNone.size} years with no months which have 5 weekends, namely:")
+    println(yearsWithNone)
+}