go语言的基础语法

go语言的字符串数组，基本变量使用，数组以及多变量赋值

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.")
        }
}