fix: coding style and file format for chapter 11, 12, 13, 14 and 15.

eBook/exercises/chapter_14/concurrent_pi2.go

@@ -1,45 +1,46 @@
-// concurrent_pi2.go
-package main
-
-import (
-	"fmt"
-	"math"
-	"runtime"
-	"time"
-)
-
-const NCPU = 2
-
-func main() {
-	start := time.Now()
-	runtime.GOMAXPROCS(2)
-	fmt.Println(CalculatePi(5000))
-	end := time.Now()
-	delta := end.Sub(start)
-	fmt.Printf("longCalculation took this amount of time: %s\n", delta) 
-}
-
-func CalculatePi(end int) float64 {
-	ch := make(chan float64)
-	for i := 0; i < NCPU; i++ {
-		go term(ch, i*end/NCPU, (i+1)*end/NCPU)
-	}
-	result := 0.0
-	for i := 0; i < NCPU; i++ {
-		result += <-ch
-	}
-	return result
-}
-
-func term(ch chan float64, start, end int) {
-	result := 0.0
-	for i := start; i < end; i++ {
-		x := float64(i)
-		result += 4 * (math.Pow(-1, x) / (2.0*x + 1.0))
-	}
-	ch <- result
-}
-/* Output:
-3.1413926535917938
-The calculation took this amount of time: 0.002000
-*/
+// concurrent_pi2.go
+package main
+
+import (
+	"fmt"
+	"math"
+	"runtime"
+	"time"
+)
+
+const NCPU = 2
+
+func main() {
+	start := time.Now()
+	runtime.GOMAXPROCS(2)
+	fmt.Println(CalculatePi(5000))
+	end := time.Now()
+	delta := end.Sub(start)
+	fmt.Printf("longCalculation took this amount of time: %s\n", delta)
+}
+
+func CalculatePi(end int) float64 {
+	ch := make(chan float64)
+	for i := 0; i < NCPU; i++ {
+		go term(ch, i*end/NCPU, (i+1)*end/NCPU)
+	}
+	result := 0.0
+	for i := 0; i < NCPU; i++ {
+		result += <-ch
+	}
+	return result
+}
+
+func term(ch chan float64, start, end int) {
+	result := 0.0
+	for i := start; i < end; i++ {
+		x := float64(i)
+		result += 4 * (math.Pow(-1, x) / (2.0*x + 1.0))
+	}
+	ch <- result
+}
+
+/* Output:
+3.1413926535917938
+The calculation took this amount of time: 0.002000
+*/