fix: coding style and file format for all example.

eBook/examples/chapter_11/multi_interfaces_poly.go

@@ -1,65 +1,66 @@
-//multi_interfaces_poly.go
-package main
-
-import "fmt"
-
-type Shaper interface {
-	Area() float32
-}
-
-type TopologicalGenus interface {
-	Rank() int
-}
-
-type Square struct {
-	side float32
-}
-
-func (sq *Square) Area() float32 {
-	return sq.side * sq.side
-}
-
-func (sq *Square) Rank() int {
-	return 1
-}
-
-type Rectangle struct {
-	length, width float32
-}
-
-func (r Rectangle) Area() float32 {
-	return r.length * r.width
-}
-
-func (r Rectangle) Rank() int {
-	return 2
-}
-
-func main() {
-	r := Rectangle{5, 3} // Area() of Rectangle needs a value
-	q := &Square{5}      // Area() of Square needs a pointer
-	shapes := []Shaper{r, q}
-	fmt.Println("Looping through shapes for area ...")
-	for n, _ := range shapes {
-		fmt.Println("Shape details: ", shapes[n])
-		fmt.Println("Area of this shape is: ", shapes[n].Area())
-	}
-	topgen := []TopologicalGenus{r, q}
-	fmt.Println("Looping through topgen for rank ...")
-	for n, _ := range topgen {
-		fmt.Println("Shape details: ", topgen[n])
-		fmt.Println("Topological Genus of this shape is: ", topgen[n].Rank())
-	}
-}
-/* Output:
-Looping through shapes for area ...
-Shape details:  {5 3}
-Area of this shape is:  15
-Shape details:  &{5}
-Area of this shape is:  25
-Looping through topgen for rank ...
-Shape details:  {5 3}
-Topological Genus of this shape is:  2
-Shape details:  &{5}
-Topological Genus of this shape is:  1
-*/
+//multi_interfaces_poly.go
+package main
+
+import "fmt"
+
+type Shaper interface {
+	Area() float32
+}
+
+type TopologicalGenus interface {
+	Rank() int
+}
+
+type Square struct {
+	side float32
+}
+
+func (sq *Square) Area() float32 {
+	return sq.side * sq.side
+}
+
+func (sq *Square) Rank() int {
+	return 1
+}
+
+type Rectangle struct {
+	length, width float32
+}
+
+func (r Rectangle) Area() float32 {
+	return r.length * r.width
+}
+
+func (r Rectangle) Rank() int {
+	return 2
+}
+
+func main() {
+	r := Rectangle{5, 3} // Area() of Rectangle needs a value
+	q := &Square{5}      // Area() of Square needs a pointer
+	shapes := []Shaper{r, q}
+	fmt.Println("Looping through shapes for area ...")
+	for n := range shapes {
+		fmt.Println("Shape details: ", shapes[n])
+		fmt.Println("Area of this shape is: ", shapes[n].Area())
+	}
+	topgen := []TopologicalGenus{r, q}
+	fmt.Println("Looping through topgen for rank ...")
+	for n := range topgen {
+		fmt.Println("Shape details: ", topgen[n])
+		fmt.Println("Topological Genus of this shape is: ", topgen[n].Rank())
+	}
+}
+
+/* Output:
+Looping through shapes for area ...
+Shape details:  {5 3}
+Area of this shape is:  15
+Shape details:  &{5}
+Area of this shape is:  25
+Looping through topgen for rank ...
+Shape details:  {5 3}
+Topological Genus of this shape is:  2
+Shape details:  &{5}
+Topological Genus of this shape is:  1
+*/