Initial data commit

Task/Biorhythms/Go/biorhythms.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+    "fmt"
+    "log"
+    "math"
+    "time"
+)
+
+const layout = "2006-01-02" // template for time.Parse
+
+var cycles = [3]string{"Physical day ", "Emotional day", "Mental day   "}
+var lengths = [3]int{23, 28, 33}
+var quadrants = [4][2]string{
+    {"up and rising", "peak"},
+    {"up but falling", "transition"},
+    {"down and falling", "valley"},
+    {"down but rising", "transition"},
+}
+
+func check(err error) {
+    if err != nil {
+        log.Fatal(err)
+    }
+}
+
+// Parameters assumed to be in YYYY-MM-DD format.
+func biorhythms(birthDate, targetDate string) {
+    bd, err := time.Parse(layout, birthDate)
+    check(err)
+    td, err := time.Parse(layout, targetDate)
+    check(err)
+    days := int(td.Sub(bd).Hours() / 24)
+    fmt.Printf("Born %s, Target %s\n", birthDate, targetDate)
+    fmt.Println("Day", days)
+    for i := 0; i < 3; i++ {
+        length := lengths[i]
+        cycle := cycles[i]
+        position := days % length
+        quadrant := position * 4 / length
+        percent := math.Sin(2 * math.Pi * float64(position) / float64(length))
+        percent = math.Floor(percent*1000) / 10
+        descript := ""
+        if percent > 95 {
+            descript = " peak"
+        } else if percent < -95 {
+            descript = " valley"
+        } else if math.Abs(percent) < 5 {
+            descript = " critical transition"
+        } else {
+            daysToAdd := (quadrant+1)*length/4 - position
+            transition := td.Add(time.Hour * 24 * time.Duration(daysToAdd))
+            trend := quadrants[quadrant][0]
+            next := quadrants[quadrant][1]
+            transStr := transition.Format(layout)
+            descript = fmt.Sprintf("%5.1f%% (%s, next %s %s)", percent, trend, next, transStr)
+        }
+        fmt.Printf("%s %2d : %s\n", cycle, position, descript)
+    }
+    fmt.Println()
+}
+
+func main() {
+    datePairs := [][2]string{
+        {"1943-03-09", "1972-07-11"},
+        {"1809-01-12", "1863-11-19"},
+        {"1809-02-12", "1863-11-19"}, // correct DOB for Abraham Lincoln
+    }
+    for _, datePair := range datePairs {
+        biorhythms(datePair[0], datePair[1])
+    }
+}