update book code

eBook/exercises/chapter_14/gofibonacci.go

@@ -0,0 +1,44 @@
+// Q26_fibonacci_go.go
+package main
+
+import (
+	"fmt"
+	"time"
+	"os"
+)
+
+func main() {
+	term := 25
+	i := 0
+	c := make(chan int)
+	start := time.Now()
+
+	go fibnterms(term, c)
+	for {
+		if result, ok := <-c; ok {
+			fmt.Printf("fibonacci(%d) is: %d\n", i, result)
+			i++
+		} else {
+			end := time.Now()
+			delta := end.Sub(start)
+			fmt.Printf("longCalculation took this amount of time: %s\n", delta) 			
+			os.Exit(0)
+		}
+	}
+}
+
+func fibnterms(term int, c chan int) {
+	for i := 0; i <= term; i++ {
+		c <- fibonacci(i)
+	}
+	close(c)
+}
+
+func fibonacci(n int) (res int) {
+	if n <= 1 {
+		res = 1
+	} else {
+		res = fibonacci(n-1) + fibonacci(n-2)
+	}
+	return
+}