Writing first Go program - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic structure of a Go program?

A Go program starts with a package main declaration, followed by an import statement for packages, and a func main() function where the program begins execution.

beginner

What does the func main() function do in a Go program?

The func main() function is the entry point of a Go program. It is where the program starts running.

beginner

How do you print text to the console in Go?

You use the fmt.Println() function from the fmt package to print text to the console.

beginner

What package must you import to use <code>fmt.Println()</code>?

You must import the <code>fmt</code> package using <code>import "fmt"</code>.

beginner

Why do Go programs start with package main?

The package main tells Go this is an executable program, not a library. It must have a main function to run.

What keyword starts a Go program's main file?

A begin program

B package main

C import main

D func start

Every Go executable program starts with the keyword package main.

Which function is the entry point of a Go program?

A func start()

B func init()

C func main()

D func run()

The func main() function is where the program begins execution.

How do you print "Hello, World!" in Go?

A fmt.Println("Hello, World!")

B print("Hello, World!")

C console.log("Hello, World!")

D echo "Hello, World!"

Use fmt.Println("Hello, World!") to print text in Go.

Which package do you import to use fmt.Println()?

A fmt

B io

C os

D log

The fmt package provides formatted I/O functions like Println.

What happens if you omit package main in a Go program?

A Program runs normally

B Program prints an error automatically

C Program runs but skips main function

D Program becomes a library, no executable

Without package main, the code is treated as a library, not an executable program.

Describe the steps to write and run your first Go program that prints "Hello, World!".

Think about the structure and the print statement.

Explain why the main function and package main are essential in a Go program.

Focus on program start and type.