Merge pull request #29 from showlovel/master

rand 已经移到 math/rand下

eBook/04.5.md

@@ -348,25 +348,25 @@ Example 4.10 [random.go](examples/chapter_4/random.go) 演示了如何生成 10
 
 	package main
 	import (
-		“fmt”
-		“rand”
-		“time”
+		"fmt"
+		"math/rand"
+		"time"
 	)
 
 	func main() {
 		for i := 0; i < 10; i++ {
 			a := rand.Int()
-			fmt.Printf(“%d / “, a)
+			fmt.Printf("%d / ", a)
 		}
 		for i := 0; i < 5; i++ {
 			r := rand.Intn(8)
-			fmt.Printf(“%d / “, r)
+			fmt.Printf("%d / ", r)
 		}
 		fmt.Println()
 		timens := int64(time.Now().Nanosecond())
 		rand.Seed(timens)
 		for i := 0; i < 10; i++ {
-			fmt.Printf(“%2.2f / “, 100*rand.Float32())
+			fmt.Printf("%2.2f / ", 100*rand.Float32())
 		}
 	}