精校：4.7

eBook/04.5.md

@@ -91,7 +91,7 @@ F || F -> false
 
 ### 4.5.2.1 整型 int 和浮点型 float
 
-Go 语言支持整型和浮点型数字，并且原生支持复数，其中位的运算采用补码（二的补码，详情参见：[http://en.wikipedia.org/wiki/Two's_complement](http://en.wikipedia.org/wiki/Two's_complement)）。
+Go 语言支持整型和浮点型数字，并且原生支持复数，其中位的运算采用补码（详情参见 [二的补码](http://en.wikipedia.org/wiki/Two's_complement) 页面）。
 
 Go 也有基于架构的类型，例如：int、uint 和 uintptr。
 

eBook/04.7.md

@@ -6,26 +6,32 @@
 
 `HasPrefix` 判断字符串 `s` 是否以 `prefix` 开头：
 
-	strings.HasPrefix(s, prefix string) bool
+```go
+strings.HasPrefix(s, prefix string) bool
+```
 
 `HasSuffix` 判断字符串 `s` 是否以 `suffix` 结尾：
 
-	strings.HasSuffix(s, suffix string) bool
+```go
+strings.HasSuffix(s, suffix string) bool
+```
 
-Example 4.13 [presuffix.go](examples/chapter_4/presuffix.go)
+示例 4.13 [presuffix.go](examples/chapter_4/presuffix.go)
 
-	package main
+```go
+package main
 
-	import (
-		"fmt"
-		"strings"
-	)
+import (
+	"fmt"
+	"strings"
+)
 
-	func main() {
-		var str string = "This is an example of a string"
-		fmt.Printf("T/F? Does the string \"%s\" have prefix %s? ", str, "Th")
-		fmt.Printf("%t\n", strings.HasPrefix(str, "Th"))
-	}
+func main() {
+	var str string = "This is an example of a string"
+	fmt.Printf("T/F? Does the string \"%s\" have prefix %s? ", str, "Th")
+	fmt.Printf("%t\n", strings.HasPrefix(str, "Th"))
+}
+```
 
 输出：
 
@@ -43,39 +49,47 @@ Example 4.13 [presuffix.go](examples/chapter_4/presuffix.go)
 
 `Index` 返回字符串 `str` 在字符串 `s` 中的索引（`str` 的第一个字符的索引），-1 表示字符串 `s` 不包含字符串 `str`：
 
-	strings.Index(s, str string) int
+```go
+strings.Index(s, str string) int
+```
 
 `LastIndex` 返回字符串 `str` 在字符串 `s` 中最后出现位置的索引（`str` 的第一个字符的索引），-1 表示字符串 `s` 不包含字符串 `str`：
 
-	strings.LastIndex(s, str string) int
+```go
+strings.LastIndex(s, str string) int
+```
 
 如果 `ch` 是非 ASCII 编码的字符，建议使用以下函数来对字符进行定位：
 
-	strings.IndexRune(s string, ch int) int
-
-Example 4.14 [index_in_string.go](examples/chapter_4/index_in_string.go)
-
-	package main
-	
-	import (
-		"fmt"
-		"strings"
-	)
-	
-	func main() {
-		var str string = "Hi, I'm Marc, Hi."
-	
-		fmt.Printf("The position of \"Marc\" is: ")
-		fmt.Printf("%d\n", strings.Index(str, "Marc"))
-	
-		fmt.Printf("The position of the first instance of \"Hi\" is: ")
-		fmt.Printf("%d\n", strings.Index(str, "Hi"))
-		fmt.Printf("The position of the last instance of \"Hi\" is: ")
-		fmt.Printf("%d\n", strings.LastIndex(str, "Hi"))
-	
-		fmt.Printf("The position of \"Burger\" is: ")
-		fmt.Printf("%d\n", strings.Index(str, "Burger"))
-	}
+```go
+strings.IndexRune(s string, ch int) int
+```
+
+示例 4.14 [index_in_string.go](examples/chapter_4/index_in_string.go)
+
+```go
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	var str string = "Hi, I'm Marc, Hi."
+
+	fmt.Printf("The position of \"Marc\" is: ")
+	fmt.Printf("%d\n", strings.Index(str, "Marc"))
+
+	fmt.Printf("The position of the first instance of \"Hi\" is: ")
+	fmt.Printf("%d\n", strings.Index(str, "Hi"))
+	fmt.Printf("The position of the last instance of \"Hi\" is: ")
+	fmt.Printf("%d\n", strings.LastIndex(str, "Hi"))
+
+	fmt.Printf("The position of \"Burger\" is: ")
+	fmt.Printf("%d\n", strings.Index(str, "Burger"))
+}
+```
 
 输出：
 
@@ -88,33 +102,39 @@ Example 4.14 [index_in_string.go](examples/chapter_4/index_in_string.go)
 
 `Replace` 用于将字符串 `str` 中的前 `n` 个字符串 `old` 替换为字符串 `new`，并返回一个新的字符串，如果 `n = -1` 则替换所有字符串 `old` 为字符串 `new`：
 
-	strings.Replace(str, old, new, n) string
+```go
+strings.Replace(str, old, new, n) string
+```
 
 ## 4.7.5 统计字符串出现次数
 
 `Count` 用于计算字符串 `str` 在字符串 `s` 中出现的非重叠次数：
 
-	strings.Count(s, str string) int
-
-Example 4.15 [count_substring.go](examples/chapter_4/count_substring.go)
-
-	package main
-	
-	import (
-		"fmt"
-		"strings"
-	)
-	
-	func main() {
-		var str string = "Hello, how is it going, Hugo?"
-		var manyG = "gggggggggg"
-	
-		fmt.Printf("Number of H's in %s is: ", str)
-		fmt.Printf("%d\n", strings.Count(str, "H"))
-	
-		fmt.Printf("Number of double g's in %s is: ", manyG)
-		fmt.Printf("%d\n", strings.Count(manyG, "gg"))
-	}
+```go
+strings.Count(s, str string) int
+```
+
+示例 4.15 [count_substring.go](examples/chapter_4/count_substring.go)
+
+```go
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	var str string = "Hello, how is it going, Hugo?"
+	var manyG = "gggggggggg"
+
+	fmt.Printf("Number of H's in %s is: ", str)
+	fmt.Printf("%d\n", strings.Count(str, "H"))
+
+	fmt.Printf("Number of double g's in %s is: ", manyG)
+	fmt.Printf("%d\n", strings.Count(manyG, "gg"))
+}
+```
 
 输出：
 
@@ -125,24 +145,28 @@ Example 4.15 [count_substring.go](examples/chapter_4/count_substring.go)
 
 `Repeat` 用于重复 `count` 次字符串 `s` 并返回一个新的字符串：
 
-	strings.Repeat(s, count int) string
-
-Example 4.16 [repeat_string.go](examples/chapter_4/repeat_string.go)
-
-	package main
-	
-	import (
-		"fmt"
-		"strings"
-	)
-	
-	func main() {
-		var origS string = "Hi there! "
-		var newS string
-	
-		newS = strings.Repeat(origS, 3)
-		fmt.Printf("The new repeated string is: %s\n", newS)
-	}
+```go
+strings.Repeat(s, count int) string
+```
+
+示例 4.16 [repeat_string.go](examples/chapter_4/repeat_string.go)
+
+```go
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	var origS string = "Hi there! "
+	var newS string
+
+	newS = strings.Repeat(origS, 3)
+	fmt.Printf("The new repeated string is: %s\n", newS)
+}
+```
 
 输出：
 
@@ -152,32 +176,38 @@ Example 4.16 [repeat_string.go](examples/chapter_4/repeat_string.go)
 
 `ToLower` 将字符串中的 Unicode 字符全部转换为相应的小写字符：
 
-	strings.ToLower(s) string
+```go
+strings.ToLower(s) string
+```
 
 `ToUpper` 将字符串中的 Unicode 字符全部转换为相应的大写字符：
 
-	strings.ToUpper(s) string
-
-Example 4.17 [toupper_lower.go](examples/chapter_4/toupper_lower.go)
-
-	package main
-	
-	import (
-		"fmt"
-		"strings"
-	)
-	
-	func main() {
-		var orig string = "Hey, how are you George?"
-		var lower string
-		var upper string
-	
-		fmt.Printf("The original string is: %s\n", orig)
-		lower = strings.ToLower(orig)
-		fmt.Printf("The lowercase string is: %s\n", lower)
-		upper = strings.ToUpper(orig)
-		fmt.Printf("The uppercase string is: %s\n", upper)
-	}
+```go
+strings.ToUpper(s) string
+```
+
+示例 4.17 [toupper_lower.go](examples/chapter_4/toupper_lower.go)
+
+```go
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	var orig string = "Hey, how are you George?"
+	var lower string
+	var upper string
+
+	fmt.Printf("The original string is: %s\n", orig)
+	lower = strings.ToLower(orig)
+	fmt.Printf("The lowercase string is: %s\n", lower)
+	upper = strings.ToUpper(orig)
+	fmt.Printf("The uppercase string is: %s\n", upper)
+}
+```
 
 输出：
 
@@ -201,35 +231,39 @@ Example 4.17 [toupper_lower.go](examples/chapter_4/toupper_lower.go)
 
 `Join` 用于将元素类型为 string 的 slice 使用分割符号来拼接组成一个字符串：
 
-	Strings.Join(sl []string, sep string)
-
-Example 4.18 [strings_splitjoin.go](examples/chapter_4/strings_splitjoin.go)
-
-	package main
-	
-	import (
-		"fmt"
-		"strings"
-	)
-	
-	func main() {
-		str := "The quick brown fox jumps over the lazy dog"
-		sl := strings.Fields(str)
-		fmt.Printf("Splitted in slice: %v\n", sl)
-		for _, val := range sl {
-			fmt.Printf("%s - ", val)
-		}
-		fmt.Println()
-		str2 := "GO1|The ABC of Go|25"
-		sl2 := strings.Split(str2, "|")
-		fmt.Printf("Splitted in slice: %v\n", sl2)
-		for _, val := range sl2 {
-			fmt.Printf("%s - ", val)
-		}
-		fmt.Println()
-		str3 := strings.Join(sl2,";")
-		fmt.Printf("sl2 joined by ;: %s\n", str3)
+```go
+Strings.Join(sl []string, sep string)
+```
+
+示例 4.18 [strings_splitjoin.go](examples/chapter_4/strings_splitjoin.go)
+
+```go
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	str := "The quick brown fox jumps over the lazy dog"
+	sl := strings.Fields(str)
+	fmt.Printf("Splitted in slice: %v\n", sl)
+	for _, val := range sl {
+		fmt.Printf("%s - ", val)
+	}
+	fmt.Println()
+	str2 := "GO1|The ABC of Go|25"
+	sl2 := strings.Split(str2, "|")
+	fmt.Printf("Splitted in slice: %v\n", sl2)
+	for _, val := range sl2 {
+		fmt.Printf("%s - ", val)
 	}
+	fmt.Println()
+	str3 := strings.Join(sl2,";")
+	fmt.Printf("sl2 joined by ;: %s\n", str3)
+}
+```
 
 输出：
 
@@ -239,7 +273,7 @@ Example 4.18 [strings_splitjoin.go](examples/chapter_4/strings_splitjoin.go)
 	GO1 - The ABC of Go - 25 -
 	sl2 joined by ;: GO1;The ABC of Go;25
 
-其它有关字符串操作的文档请参阅官方文档 [http://golang.org/pkg/strings/](http://golang.org/pkg/strings/)（ ***译者注：国内用户可访问 [http://docs.studygolang.com/pkg/strings/](http://docs.studygolang.com/pkg/strings/)*** ）。
+其它有关字符串操作的文档请参阅官方文档 [http://golang.org/pkg/strings/](http://golang.org/pkg/strings/)（ **译者注：国内用户可访问 [该页面](http://docs.studygolang.com/pkg/strings/)** ）。
 
 ## 4.7.11 从字符串中读取内容
 
@@ -274,28 +308,30 @@ Example 4.18 [strings_splitjoin.go](examples/chapter_4/strings_splitjoin.go)
 
 在下面这个示例中，我们忽略可能出现的转换错误：
 
-Example 4.19 [string_conversion.go](examples/chapter_4/string_conversion.go)
-
-	package main
-	
-	import (
-		"fmt"
-		"strconv"
-	)
-	
-	func main() {
-		var orig string = "666"
-		var an int
-		var newS string
-	
-		fmt.Printf("The size of ints is: %d\n", strconv.IntSize)	  
-	
-		an, _ = strconv.Atoi(orig)
-		fmt.Printf("The integer is: %d\n", an) 
-		an = an + 5
-		newS = strconv.Itoa(an)
-		fmt.Printf("The new string is: %s\n", newS)
-	}
+示例 4.19 [string_conversion.go](examples/chapter_4/string_conversion.go)
+
+```go
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func main() {
+	var orig string = "666"
+	var an int
+	var newS string
+
+	fmt.Printf("The size of ints is: %d\n", strconv.IntSize)	  
+
+	an, _ = strconv.Atoi(orig)
+	fmt.Printf("The integer is: %d\n", an) 
+	an = an + 5
+	newS = strconv.Itoa(an)
+	fmt.Printf("The new string is: %s\n", newS)
+}
+```
 
 输出：
 
@@ -305,7 +341,7 @@ Example 4.19 [string_conversion.go](examples/chapter_4/string_conversion.go)
 
 在第 5.1 节，我们将会利用 if 语句来对可能出现的错误进行分类处理。
 
-更多有关该包的讨论，请参阅官方文档 [http://golang.org/pkg/strconv/](http://golang.org/pkg/strconv/)（ ***译者注：国内用户可访问 [http://docs.studygolang.com/pkg/strconv/](http://docs.studygolang.com/pkg/strconv/)*** ）。
+更多有关该包的讨论，请参阅官方文档 [http://golang.org/pkg/strconv/](http://golang.org/pkg/strconv/)（ **译者注：国内用户可访问 [该页面](http://docs.studygolang.com/pkg/strconv/)** ）。
 
 ## 链接