Why input and output are required in Go - See It in Action

Why input and output are required

📖 Scenario: Imagine you want to create a simple program that asks a user for their name and then says hello to them. To do this, the program needs to get information from the user (input) and then show a message back (output).

🎯 Goal: Build a small Go program that asks for a user's name and then prints a greeting message using that name.

📋 What You'll Learn

Use fmt.Scanln to get input from the user

Use fmt.Println to show output to the user

Store the input in a variable called name

Print a greeting message that includes the name

💡 Why This Matters

🌍 Real World

Many programs need to ask users questions and show answers, like calculators, games, or websites.

💼 Career

Understanding input and output is a basic skill for any programmer to make interactive applications.

1

Create a variable to store the user's name

Declare a variable called name of type string to hold the user's input.

Go

package main

import "fmt"

func main() {
    // Declare a variable called name of type string
    // Your code here
}

Need a hint?

Use var name string to create a variable that can hold text.

2

Get the user's name as input

Use fmt.Scanln(&name) to read the user's input and store it in the variable name.

Go

package main

import "fmt"

func main() {
    var name string
    // Use fmt.Scanln to get input from the user and store it in name
    // Your code here
}

Need a hint?

Use fmt.Scanln(&name) to read what the user types and save it in name.

3

Print a greeting message using the input

Use fmt.Println with a message that says Hello, followed by the value of name.

Go

package main

import "fmt"

func main() {
    var name string
    fmt.Scanln(&name)
    // Print a greeting message that includes the name
    // Your code here
}

Need a hint?

Use fmt.Println("Hello,", name) to show the greeting.

4

Run the program and see the output

Run the program. When it asks for input, type GoLearner and press Enter. The program should print Hello, GoLearner.

Go

package main

import "fmt"

func main() {
    var name string
    fmt.Scanln(&name)
    fmt.Println("Hello,", name)
    // Run the program and check the output
    // Your code here
}

Need a hint?

Type GoLearner when the program waits for input, then press Enter to see the greeting.