//字符串反转
package main
import "fmt"
func reverse(str string) string {
var result string
strLen := len(str)
for i := 0; i < strLen; i++ {
result = result + fmt.Sprintf("%c", str[strLen-i-1])
}
return result
}
func reverse1(str string) string {
var result []byte
tmp := []byte(str)
length := len(str)
for i := 0; i < length; i++ {
result = append(result, tmp[length-i-1])
}
return string(result)
}
func main() {
var str1 = "hello"
str2 := "world"
str3 := fmt.Sprintf("%s %s", str1, str2)
n := len(str3)
fmt.Println(str3)
fmt.Printf("len(str3)=%d\n", n)
substr := str3[0:5]
fmt.Println(substr)
substr = str3[6:]
fmt.Println(substr)
result := reverse(str3)
fmt.Println(result)
result = reverse1(result)
fmt.Println(result)
}
字符串练习
package main
import (
"fmt"
)
func testString() {
var str = "hello"
fmt.Printf("str[0]=%c len(str)=%d\n", str[0], len(str))
for index, val := range str {
fmt.Printf("str[%d]=%c\n", index, val)
}
//str[0] = '0'
//fmt.Println("after modify:", str)
var byteSlice []byte
byteSlice = []byte(str)
byteSlice[0] = '0'
str = string(byteSlice)
fmt.Println("after modify:", str)
fmt.Printf("len(str)=%d\n", len(str))
str = "hello, 少林之巅"
fmt.Printf("len(str)=%d\n", len(str))
str = "中问123"
fmt.Printf("last:len(str)=%d\n", len(str))
var b rune = '中'
fmt.Printf("b=%c\n", b)
var runeSlice []rune
runeSlice = []rune(str)
fmt.Printf("str 长度:%d, len(str)=%d\n", len(runeSlice), len(str))
}
func testReverseStringV1() {
var str = "hello中文 "
var bytes []byte = []byte(str)
for i := 0; i < len(str)/2; i++ {
tmp := bytes[len(str)-i-1]
bytes[len(str)-i-1] = bytes[i]
bytes[i] = tmp
}
str = string(bytes)
fmt.Println(str)
}
func testReverseStringV2() {
var str = "hello中文 "
var r []rune = []rune(str)
for i := 0; i < len(r)/2; i++ {
tmp := r[len(r)-i-1]
r[len(r)-i-1] = r[i]
r[i] = tmp
}
str = string(r)
fmt.Println(str)
}
func testHuiWen() {
var str = "上海自来水来自海上"
var r []rune = []rune(str)
for i := 0; i < len(r)/2; i++ {
tmp := r[len(r)-i-1]
r[len(r)-i-1] = r[i]
r[i] = tmp
}
str2 := string(r)
if str2 == str {
fmt.Println(str, " is huiwen")
} else {
fmt.Println(str, " is not huiwen")
}
}
func main() {
//testString()
//testReverseStringV2()
testHuiWen()
}