Project CLI Greeting Tool

Context

This project combines several basic concepts: reading user input (using bufio), handling strings (strings.TrimSpace), and printing formatted output.

The program will:

Ask for the user’s name.
Ask for their favourite colour.
Print a personalised greeting.

Detailed explanation of used packages

bufio – Provides buffered I/O, which is efficient for reading whole lines.
os.Stdin – Standard input (the terminal).
strings.TrimSpace – Removes leading/trailing whitespace and newlines.
fmt.Printf – Formatted printing with %s for strings and \n for newline.

Step‑by‑step code

package main

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

func main() {
    // Create a buffered reader from standard input
    reader := bufio.NewReader(os.Stdin)

    // Prompt for name
    fmt.Print("Enter your name: ")
    name, err := reader.ReadString('\n')
    if err != nil {
        fmt.Println("Error reading input:", err)
        return
    }
    name = strings.TrimSpace(name) // remove newline and spaces

    // Prompt for colour
    fmt.Print("Enter your favourite colour: ")
    colour, err := reader.ReadString('\n')
    if err != nil {
        fmt.Println("Error reading input:", err)
        return
    }
    colour = strings.TrimSpace(colour)

    // Print greeting
    fmt.Printf("\nHello %s! Your favourite colour %s is awesome!\n", name, colour)
}

Example interaction

Enter your name: Alice
Enter your favourite colour: blue

Hello Alice! Your favourite colour blue is awesome!

Error handling

If the user presses Ctrl+D (EOF) or an error occurs, the program prints an error and exits gracefully.

Extensions (optional)

Add colour using ANSI escape codes.
Validate that the colour is not empty.
Use a loop to ask again if input is invalid.