Un cours pour se lancer dans la programmation avec le langage Go (golang).
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  1. /* Copyright (C) 2011-2023 Patrick H. E. Foubet - E2L Ivry
  2. Ecole du Logiciel Libre : https://e2li.org/
  3. This program is free software: you can redistribute it and/or modify
  4. it under the terms of the GNU General Public License as published by
  5. the Free Software Foundation, either version 3 of the License, or any
  6. later version.
  7. This program is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  10. GNU General Public License for more details.
  11. You should have received a copy of the GNU General Public License
  12. along with this program. If not, see <http://www.gnu.org/licenses/>
  13. *******************************************************************/
  14. package main
  15. import (
  16. "fmt"
  17. "math"
  18. "net/http"
  19. )
  20. type bob int
  21. func (b bob) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  22. w.Write([]byte("Salut tout le Monde !"))
  23. }
  24. type Circle struct {
  25. Radius float64
  26. }
  27. type Rectangle struct {
  28. Width float64
  29. Height float64
  30. }
  31. type Shape interface {
  32. Area() float64
  33. }
  34. func GetArea(s Shape) float64 {
  35. return s.Area()
  36. }
  37. func (c *Circle) Area() float64 {
  38. return math.Pi * c.Radius * c.Radius
  39. }
  40. func (r Rectangle) Area() float64 {
  41. return r.Height * r.Width
  42. }
  43. func main() {
  44. circle := Circle{5.0}
  45. r1 := Rectangle{4.0, 5.0}
  46. r2 := &Rectangle{10.0, 15.0}
  47. area := circle.Area()
  48. fmt.Println(area)
  49. GetArea(&circle)
  50. GetArea(r1)
  51. GetArea(r2)
  52. var x interface{} = 10
  53. fmt.Println(x)
  54. str, ok := x.(string)
  55. if !ok {
  56. fmt.Println("Ne peut pas convertir l'interface x")
  57. }
  58. fmt.Printf("valeur: %v, Type: %T\n", x, x)
  59. x = 1
  60. fmt.Printf("valeur: %v, Type: %T\n", x, x)
  61. fmt.Printf("valeur: %v, Type: %T\n", str, str)
  62. var y interface{} = "go"
  63. switch v := y.(type) {
  64. case int:
  65. fmt.Printf("Le double de %v vaut %v\n", v, v*2)
  66. case string:
  67. fmt.Printf("%q a une longueur de %v octets\n", v, len(v))
  68. default:
  69. fmt.Printf("Le type de %T est inconnu !\n", v)
  70. }
  71. }