Go语言中strings和strconv包示例代码详解

strings.HaxPrefix(s string, prefix string) bool

package main
import (
  "fmt"
  "strings"
)
func main() {
  pre := "Thi"
  str1 := "This is a Go program!"
  fmt.Println(strings.HasPrefix(str1, pre))
}

strings.HasSuffix(s string, suffix string) bool

package main
import (
  "fmt"
  "strings"
)
func main() {
  suffix := "am!"
  str1 := "This is a Go program!"
  fmt.Println(strings.HasSuffix(str1, suffix))
}

strings.Contains(s string, substr string) bool

package main
import (
  "fmt"
  "strings"
)
func main() {
substr := "is"
  str1 := "This is a Go program!"
  fmt.Println(strings.Contains(str1, substr))
}

strings.Index(s string, sbustr string) int

package main
import (
  "fmt"
  "strings"
)
func main() {
  substr := "is"
  substr2 := "Hi"
  str1 := "This is a Go program!"
  fmt.Println(strings.Index(str1, substr)) //输出2
  fmt.Println(strings.Index(str1, substr2))//输出-1
}

strings.LastIndex(s string, substr string) int

package main
import (
  "fmt"
  "strings"
)
func main() {
  substr := "is"
  substr2 := "Hi"
  str1 := "This is a Go program!"
  fmt.Println(strings.LastIndex(str1, substr)) //输出5
  fmt.Println(strings.LastIndex(str1, substr2))//输出-1
}

strings.IndexRune(s string, r rune) int

package main
import (
  "fmt"
  "strings"
)
func main() {
  substr := '中'
  substr2 := '天'
  str1 := "我爱你中国"
  fmt.Println(strings.IndexRune(str1, substr)) //输出9
  fmt.Println(strings.IndexRune(str1, substr2))//输出-1
}
package main
import (
  "fmt"
  "strings"
)
func main() {
  substr := "中"
  substr2 := "天"
  str1 := "我爱你𤋮中国"
  //常见的汉字在utf8中占3个字节，某些特殊的汉字(如𤋮)在utf8中占四个字节，所以输出结果是13而不是12
  fmt.Println(strings.Index(str1, substr)) //输出13
  fmt.Println(strings.Index(str1, substr2))//输出-1
}

strings.Replace(s string, old string, new string, n int) string

package main
import (
  "fmt"
  "strings"
)
func main() {
  str1 := "我爱你熙中国熙"
  fmt.Println(strings.Replace(str1, "熙", "", 1)) //我爱你中国熙
  fmt.Println(strings.Replace(str1, "熙", "", -1)) //我爱你中国
}

strings.Count(s string, substr string) int

package main
import (
  "fmt"
  "strings"
)
func main() {
  substr := "is"
  s := "This is a go program!"
  fmt.Println(strings.Count(s, substr)) //2
}

strings.Repeat(s string, count int) string

package main
import (
  "fmt"
  "strings"
)
func main() {
  s := "This is a go program!"
  fmt.Println(strings.Repeat(s, 2)) //This is a go program!This is a go program!
}

strings.ToLower(s string) string

strings.ToUpper(s string) string

package main
import (
  "fmt"
  "strings"
)
func main() {
  s := "This is a Go program!"
  fmt.Println(strings.ToLower(s)) //this is a go program!
  fmt.Println(strings.ToUpper(s)) //THIS IS A GO PROGRAM!
}

strings.TrimSpace(s string) string

package main
import (
  "fmt"
  "strings"
)
func main() {
  s := " ThisThis is a Go program!This "
  fmt.Println(s) //原生打印
  fmt.Println(strings.TrimSpace(s)) //剔除空格后的字符串
}

strings.Trim(s string cutset string) string
strings.TrimLeft(s string, cutset string) string
strings.TrumRight(s string, cutset string) string

package main
import (
  "fmt"
  "strings"
)
func main() {
  s := "ThisThis is a Go program!This"
  fmt.Println(strings.Trim(s, "This")) // is a Go program!
  fmt.Println(strings.TrimLeft(s, "This"))//is a Go program!This
  fmt.Println(strings.TrimRight(s, "This"))//ThisThis is a Go program!
}

strings.Fields(s string) []string

package main
import (
  "fmt"
  "strings"
)
func main() {
  s := "This is a Go program!"
  fmt.Printf("%v\n", strings.Fields(s)) //[This is a Go program!]
}

strings.Split(s string, sep string) []string

package main
import (
  "fmt"
  "strings"
)
func main() {
  s := "This is a Go program!"
  result := strings.Split(s, "Go")
  fmt.Printf("%v\n", result) //[This is a  program!]
  for _, value := range result {
    fmt.Printf("%s\n", value)
  }
}

strings.Join(a []string, sep string) string

package main
import (
  "fmt"
  "strings"
)
func main() {
  var s []string = []string{"I", "love", "you"}
  fmt.Println(strings.Join(s, " ")) //I love you
}

package main
import (
  "fmt"
  "strconv"
)
func main() {
  origin := "666"
  var an int
  var newS string
  fmt.Printf("int类型的位数为: %d\n", strconv.IntSize)
  an, _ = strconv.Atoi(origin)
  fmt.Println(an)
  an += 5
  newS = strconv.Itoa(an)
  fmt.Println(newS)
}