Hello, World in Go

Every Go executable starts with package main and a func main() entry point. Output uses the fmt package—similar to System.out.println in Java or print() in Python, but requires an explicit import.

Minimal program

package main

import "fmt"

func main() {
    fmt.Println("Hello, World")
}

fmt.Println writes to stdout with a trailing newline. Use fmt.Print when you control line endings yourself.

Imports and formatting

Go requires imports for standard library packages. Unused imports are compile errors—delete them or use the value. go fmt standardizes indentation (tabs) and import grouping.

Important interview questions and answers

1. Q: What prints text in Go?
   A: fmt.Println, fmt.Printf, and fmt.Print from the fmt package.
2. Q: Can you run code without main?
   A: Libraries use package somethingelse; only package main with func main() builds an executable.

Self-check

1. Which keyword declares the executable package?
2. What happens if you import fmt but never use it?

Tip: Every executable needs package main and func main()—unlike Python scripts that run top-level statements without an entry point.