added code for lecture 26

main.go

@@ -1,38 +1,58 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 )
 
+const portNumber = ":8080"
+
 // Home is the handler for the home page
 func Home(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprintf(w, "This is the home page")
 }
 
 // About is the handler for the about page
 func About(w http.ResponseWriter, r *http.Request) {
-	owner, saying := getData()
 	sum := addValues(2, 2)
-	fmt.Fprintf(w, fmt.Sprintf("This is the about page of %s, \nI like to say %s, \nand as a side note, 2 + 2 is %d", owner, saying, sum))
+	_, _ = fmt.Fprintf(w, fmt.Sprintf("This is the about page and 2 + 2 is %d", sum))
+}
+
+// Divide divides one value into another and returns message with result
+func Divide(w http.ResponseWriter, r *http.Request) {
+	x := 100.0
+	y := 0.0
+	f, err := divideValues(x, y)
+	if err != nil {
+		_, _ = fmt.Fprintf(w, "Error: Division by zero is not a valid operation. Error returned: %s", err)
+		return
+	}
+
+	_, _ = fmt.Fprintf(w, fmt.Sprintf("%f divided by %f is %f", x, y, f))
+}
+
+// divideValues divides two floats x and y, and returns the quotient and a value of type error
+func divideValues(x, y float64) (float64, error) {
+	if y == 0 {
+		err := errors.New("Divisor is zero!")
+		return 0, err
+	}
+	result := x / y
+	return result, nil
 }
 
 // addValues adds two ints x and y, and returns the sum
 func addValues(x, y int) int {
 	return x + y
 }
 
-// getData returns a name and a saying
-func getData() (string, string) {
-	o := "Rick Sanchez"
-	s := "Wubba Lubba Dup Dup!"
-	return o, s
-}
-
 // main is the main function
 func main() {
 	http.HandleFunc("/", Home)
 	http.HandleFunc("/about", About)
+	http.HandleFunc("/divide", Divide)
 
-	_ = http.ListenAndServe(":8080", nil)
+	fmt.Println(fmt.Sprintf("Starting application on port %s", portNumber))
+	_ = http.ListenAndServe(portNumber, nil)
 }