Basic I O

Context

Go provides several ways to read input and write output. The most common are:

• Output: fmt.Print, fmt.Println, fmt.Printf
• Input: fmt.Scan, fmt.Scanln, fmt.Scanf, and bufio for full lines.

Example

Read a name and age from the user, then print a greeting.

Code example

package main

import (
    "bufio"
    "fmt"
    "os"
    "strconv"
    "strings"
)

func main() {
    reader := bufio.NewReader(os.Stdin)

    fmt.Print("Enter your name: ")
    name, _ := reader.ReadString('\n')
    name = strings.TrimSpace(name)

    fmt.Print("Enter your age: ")
    ageStr, _ := reader.ReadString('\n')
    age, _ := strconv.Atoi(strings.TrimSpace(ageStr))

    fmt.Printf("Hello %s, you are %d years old.\n", name, age)
}

Example interaction

Enter your name: Alice
Enter your age: 30
Hello Alice, you are 30 years old.

Useful links

• fmt package documentation
• bufio package documentation