fa directory created

fa/code/src/apps/ch.2.6/reflection/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+func show_interface_none() {
+	fmt.Println("\nshow_interface_none()")
+	var a interface{}
+	a = "string"
+	a = 1
+	a = false
+	fmt.Println("a =", a)
+}
+func show_reflection() {
+	fmt.Println("\nshow_reflection()")
+	var x float64 = 3.4
+	v := reflect.ValueOf(x)
+	fmt.Println("type:", v.Type())
+	fmt.Println("kind is float64:", v.Kind() == reflect.Float64)
+	fmt.Println("value:", v.Float())
+	
+	p := reflect.ValueOf(&x)
+	newX := p.Elem()
+	newX.SetFloat(7.1)
+	fmt.Println("newX =", newX)
+	fmt.Println("newX float64() value:", newX.Float())
+}
+func main() {
+	show_interface_none()
+	show_reflection()
+}