Add structs

structs/structs.go

@@ -0,0 +1,90 @@
+package structs
+
+import (
+	"fmt"
+	"math"
+)
+
+type ShapeMetadata struct {
+	Id   int
+	Name string
+}
+
+type Shape interface {
+	Area() float64
+	Perimeter() float64
+}
+
+type Square struct {
+	ShapeMetadata
+	Size float64
+}
+
+type Rectangle struct {
+	ShapeMetadata
+	Length, Breadth float64
+}
+
+type Triangle struct {
+	ShapeMetadata
+	A, B, C float64
+}
+
+func (s *Square) Area() float64 {
+	return s.Size * s.Size
+}
+
+func (s *Square) Perimeter() float64 {
+	return 4 * s.Size
+}
+
+func (r *Rectangle) Area() float64 {
+	return r.Length * r.Breadth
+}
+
+func (r *Rectangle) Perimeter() float64 {
+	return 2 * (r.Length + r.Breadth)
+}
+
+func (t *Triangle) Area() float64 {
+	s := (t.A + t.B + t.C) / 2
+	area := math.Sqrt(s * (s - t.A) * (s - t.B) * (s - t.C))
+	return area
+}
+
+func (t *Triangle) Perimeter() float64 {
+	return t.A + t.B + t.C
+}
+
+func Structs() {
+	sq := Square{
+		ShapeMetadata: ShapeMetadata{
+			Id:   0,
+			Name: "mysquare",
+		},
+		Size: 10.0,
+	}
+
+	rect := Rectangle{
+		ShapeMetadata: ShapeMetadata{
+			Id:   0,
+			Name: "myrectangle",
+		},
+		Length:  10,
+		Breadth: 5,
+	}
+
+	tri := Triangle{
+		ShapeMetadata: ShapeMetadata{
+			Id:   0,
+			Name: "mytriangle",
+		},
+		A: 2,
+		B: 2,
+		C: 2,
+	}
+
+	fmt.Printf("Triangle: Area = %.2f Perimeter = %.2f\n", tri.Area(), tri.Perimeter())
+	fmt.Printf("Rectangle: Area = %.2f Perimeter = %.2f\n", rect.Area(), rect.Perimeter())
+	fmt.Printf("Square: Area = %.2f Perimeter = %.2f\n", sq.Area(), sq.Perimeter())
+}