go语言中“fmt”所有方法的示例 在 Go 语言中，fmt包提供了很多格式化输入输出的函数。以下是一些主要函数的示例：Print系列函数：Print：打印输出，不换行。Println：打印输出，换行。Printf：格式化打印输出。package main import "fmt" func main() { fmt.Print("Hello") // Hello fmt.Println(" World!") // World! 和上面输出在一行 fmt.Printf("Today is %s\n", "Wednesday") // Today is Wednesday } Sprint系列函数：Sprint：返回格式化后的字符串，不换行。Sprintln：返回格式化后的字符串，换行。Sprintf：格式化并返回字符串。package main import "fmt" func main() { str := fmt.Sprint("Hello") strWithNewLine := fmt.Sprintln(" World!") formattedStr := fmt.Sprintf("Today is %s", "Wednesday") fmt.Println(str) // Hello fmt.Println(strWithNewLine) // World! fmt.Println(formattedStr) // Today is Wednesday } Fprint系列函数：将内容输出到指定的io.Writer。package main import ( "fmt" "os" ) func main() { file, err := os.Create("output.txt") if err != nil { fmt.Println(err) return } defer func(file *os.File) { _ = file.Close() }(file) _, _ = fmt.Fprint(file, "Hello") _, _ = fmt.Fprintln(file, " World!") _, _ = fmt.Fprintf(file, "Today is %s", "Wednesday") // 向标准输出写入 _, _ = fmt.Fprint(os.Stdout, "Writing to stdout") } Errorf：返回一个包含错误信息的error类型。package main import "fmt" func divide(a, b int) (int, error) { if b == 0 { return 0, fmt.Errorf("division by zero") } return a / b, nil } func main() { result, err := divide(10, 0) if err != nil { fmt.Println(err) } else { fmt.Println(result) } } Scan系列函数：从标准输入读取数据。package main import "fmt" func main() { var name string var age int fmt.Print("Enter your name and age: \n") _, _ = fmt.Scan(&name, &age) fmt.Printf("Hello, %s! You are %d years old.\n", name, age) }Sscan系列函数：从字符串中读取数据。package main import "fmt" func main() { str := "Alice 25" var name string var age int _, _ = fmt.Sscan(str, &name, &age) fmt.Printf("Hello, %s! You are %d years old.\n", name, age) // Hello, Alice! You are 25 years old. } Fscan系列函数：从io.Reader中读取数据。package main import ( "bufio" "fmt" "os" ) func main() { file, err := os.Open("input.txt") if err != nil { fmt.Println(err) return } defer func(file *os.File) { _ = file.Close() }(file) reader := bufio.NewReader(file) var name string var age int _, _ = fmt.Fscan(reader, &name, &age) fmt.Printf("Hello, %s! You are %d years old.\n", name, age) }