2016 Update

Task/Topic-variable/Go/topic-variable.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+    "math"
+    "os"
+    "strconv"
+    "text/template"
+)
+
+func sqr(x string) string {
+    f, err := strconv.ParseFloat(x, 64)
+    if err != nil {
+        return "NA"
+    }
+    return strconv.FormatFloat(f*f, 'f', -1, 64)
+}
+
+func sqrt(x string) string {
+    f, err := strconv.ParseFloat(x, 64)
+    if err != nil {
+        return "NA"
+    }
+    return strconv.FormatFloat(math.Sqrt(f), 'f', -1, 64)
+}
+
+func main() {
+    f := template.FuncMap{"sqr": sqr, "sqrt": sqrt}
+    t := template.Must(template.New("").Funcs(f).Parse(`. = {{.}}
+square: {{sqr .}}
+square root: {{sqrt .}}
+`))
+    t.Execute(os.Stdout, "3")
+}