A-M baby

Task/Five-weekends/Go/five-weekends.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+    "fmt"
+    "time"
+)
+
+func main() {
+    var n int                                 // for task item 2
+    var first, last time.Time                 // for task item 3
+    haveNone := make([]int, 0, 29)            // for extra credit
+    fmt.Println("Months with five weekends:") // for task item 1
+    for year := 1900; year <= 2100; year++ {
+        var hasOne bool // for extra credit
+        for _, month := range []time.Month{1, 3, 5, 7, 8, 10, 12} {
+            t := time.Date(year, month, 1, 0, 0, 0, 0, time.UTC)
+            if t.Weekday() == time.Friday {
+                // task item 1:  show month
+                fmt.Println("  ", t.Format("2006 January"))
+                n++
+                hasOne = true
+                last = t
+                if first.IsZero() {
+                    first = t
+                }
+            }
+        }
+        if !hasOne {
+            haveNone = append(haveNone, year)
+        }
+    }
+    fmt.Println(n, "total\n") // task item 2: number of months
+    // task item 3
+    fmt.Println("First five dates of weekends:")
+    for i := 0; i < 5; i++ {
+        fmt.Println("  ", first.Format("Monday, January 2, 2006"))
+        first = first.Add(7 * 24 * time.Hour)
+    }
+    fmt.Println("Last five dates of weekends:")
+    for i := 0; i < 5; i++ {
+        fmt.Println("  ", last.Format("Monday, January 2, 2006"))
+        last = last.Add(7 * 24 * time.Hour)
+    }
+    // extra credit
+    fmt.Println("\nYears with no months with five weekends:")
+    for _, y := range haveNone {
+        fmt.Println("  ", y)
+    }
+    fmt.Println(len(haveNone), "total")
+}