Исходники и презентации

lessons/interfaces/incorrect_methods/main.go

@@ -0,0 +1,20 @@
+package main
+
+type Shape interface {
+	Area() float64
+}
+
+type Circle struct {
+	radius float64
+}
+
+func (c Circle) Area() int {
+	return int(3.14 * c.radius * c.radius)
+}
+
+func main() {
+	circle := Circle{}
+	var iface interface{} = circle
+	shape := iface.(Shape)
+	_ = shape
+}