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                ??一站式輕松地調用各大LLM模型接口,支持GPT4、智譜、豆包、星火、月之暗面及文生圖、文生視頻 廣告
                ``` if contents,err:=ioutil.ReadFile("abc.txt");err == nil{ fmt.Print(string(contents)) }else { fmt.Println("connot print file contents:",err) } ``` if的條件里可以賦值 if的條件里賦值的變量作用域就在這個if語句里 ``` func file(filename string) { if contents,err:=ioutil.ReadFile(filename);err == nil{ fmt.Print(string(contents)) }else { fmt.Println("connot print file contents:",err) } } func op(a, b int, op string) int { var res int switch op { case "+": res=a+b case "-": res=a-b default: panic("unsupported operator"+op) } return res } func s( num int) string{ g := "" switch { case num>100: g="F"; case num<=100: g="E" default: g="A" } return g } ``` 一個main函數了解條件與循環 ``` package main import ( "fmt" "io/ioutil" ) func grade(score int) string { g := "" switch { case score < 0 || score > 100: // panic("wrong score", score) case score < 60: g = "F" case score < 80: g = "C" case score < 90: g = "B" case score <= 100: g = "A" } return g } func readFile(filename string) string { contents, err := ioutil.ReadFile(filename) if err != nil { panic(err) } // else { // fmt.Printf("%s\n", contents) // } return string(contents) // // if的條件里可以賦值,其賦值的變量作用域就在if的block中 // if contents, err := ioutil.ReadFile(filename); err != nil { // fmt.Println(err) // } else { // fmt.Printf("%s\n", contents) // } } func forcs(cs int) { for i := 0; i < cs; i++ { fmt.Printf("i 的值為: %d\n", i) } } func xiao() { var b int = 5 var a int for a < b { a++ fmt.Printf("a 的值為: %d\n", a) } } func ranges() { numbers := [6]int{1, 2, 3, 5} for i, x := range numbers { fmt.Printf("第 %d 位 x 的值 = %d\n", i, x) } } func while() { for { fmt.Printf("this is while") } } func formap() { map1 := make(map[string]string) map1["A"] = "AAAA" map1["B"] = "BBBB" map1["C"] = "CCCC" for k, v := range map1 { fmt.Println("key:", k, "value:", v) } } func forarray() { array := [...]int64{1, 2, 3, 4} for k, v := range array { fmt.Println("key:", k, "value:", v) } } func forslice() { array := [...]int64{1, 2, 3, 4} slice := array[:3:3] for k, v := range slice { fmt.Println("key:", k, "value:", v) } } func array2() { s := [...][2]string{{"a", "b"}, {"c", "d"}} for _, v := range s { for _, t := range v { fmt.Println(t) } } } func main() { array2() forslice() forarray() formap() while() ranges() xiao() forcs(2) fmt.Println(readFile("1.txt")) fmt.Println(grade(100)) } ```
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