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1. IF判断(aa.txt内容:asdfgh。bb.txt内容:12345) package main import ( "io/ioutil" "fmt" ) func main() { const filename1, filename2 = "aa.txt", "bb.txt" contents, err := ioutil.ReadFile(filename1) if err != nil { fmt.Println(err) } else{ fmt.Printf("%s\n", contents) } fmt.Printf("%s\n", contents) //打印出filename1的内容 if contents, err := ioutil.ReadFile(filename2);err != nil { fmt.Println(err) } else { fmt.Printf("%s\n", contents) } fmt.Printf("%s\n", contents) //还是打印出filename1的内容,filename2在if条件内,跳出IF之后失效(IP内部赋值,只对本次IF有效) } 打印结果; asdfgh asdfgh 12345 asdfgh [Finished in 0.6s] 2. switch package main import ( "fmt" ) //定义函数:grade:函数名。score:传入的变量,类型是int。string:函数返回的类型。 func grade(score int) string { g := "" switch { case score < 0 || score > 100: panic(fmt.Sprintf( "Wrong score: %d", score)) case score < 60: g = "F" case score < 80: g = "C" case score < 90: g = "B" case score <= 100: g = "A" default://在本次switch中可以不写default,因为第一个case已经判断了所以的异常 panic(fmt.Sprintf( "Wrong score: %d", score)) } return g } func main() { fmt.Println(grade(50),grade(60),grade(90),grade(10)) } 打印结果: F C A F [Finished in 0.7s]
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