字符串数组
package main
import (
"fmt"
)
func main() {
var str string
str = "hello world"
ch := str[0]
fmt.Printf("the length of\"%s\" is %d \n", str, len(str))
fmt.Println("the first character of\"%s\"is %c.\n", str, ch)
}
基本变量
package main
import (
"fmt"
)
func main() {
/*变量使用
var v1, v2, v3 int
var v4, v5 bool
v1, v2, v3 = 10, 20, 30
v4, v5 = true, false
fmt.Println(v1, v2, v3, v4, v5)
fmt.Println("Hello World!")
v4, v5 = v5, v4
v1, v2, v3 = v3, v1, v2//赋值变量交换，不限数量
fmt.Println(v1, v2, v3, v4, v5)
v6 := 100//省略var声明的定义赋值 :=
fmt.Println(v6)
*/
/*常量使用
const N = 100
const MAX_SIZE = 10
fmt.Println(N, MAX_SIZE)
const School = "China West Normal University"
fmt.Println(School)
*/
/*字节切片转换字符串
s := "hello"
c := []byte(s) // 将字符串 s 转换为 []byte 类型
c[0] = 'c'
c[3] = 'c'
s2 := string(c) // 再转换回 string 类型
fmt.Printf("%s\n", s2)
*/
/*指针数组
a, b, c := 10, 20, 30
var arr [3]*int//定义的是数组存地址
arr[0] = &a
arr[1] = &b
arr[2] = &c
for i := 0; i < 3; i++ {
fmt.Printf("%5d", *arr[i])//引用数组地址指向的值
}
*/
/*数组作为函数参数
func main() {
x := [5]int{1, 2, 3, 4, 5}
f(x, true)
f(x, false)
}
func f(a [5]int, b bool) {
for i := 0; i < len(a); i++ {
if b {
a[i] += 10
}
fmt.Printf("%5d", a[i])
}
fmt.Println()
}
*/
/*map定义并赋初值
dict := map[string]int{"abc": 12, "bcd": 100, "chen": 200}
//var 字典名 map[类型1]类型2 ,其中类型1为索引类型，类型2为存放的数据类型。
for x, y := range dict {
fmt.Println(x, y)
}
*/
}
数组
package main
import (
"fmt"
)
func main() {
array := [5]int{1, 2, 3, 4, 5}
fmt.Println("Hello World!")
for i := 0; i < len(array); i++ {
fmt.Println("element", i, "of array is", array[i])
}
}
多变量赋值
package main
import (
"fmt"
)
func main() {
fmt.Println("Hello World!")
var i int32
var j int64
i, j = 1, 2
/*if i == j {
fmt.Println("i and j are equal.")
}*/
if i == 1 || j == 2 {
fmt.Println("i and j are equal.")
}
}
