Go program structure - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic structure of a Go program?

A Go program starts with a <code>package</code> declaration, followed by import statements, and then the <code>func main()</code> function where the program execution begins.

beginner

What is the purpose of the package main declaration in a Go program?

The package main tells the Go compiler that this program is an executable and should have a main() function as the entry point.

beginner

Where does the execution of a Go program start?

Execution starts at the main() function inside the package main. This function is the entry point of the program.

beginner

Why do we use import statements in Go?

We use import statements to include other packages that provide useful functions and features, like fmt for printing output.

beginner

Show a simple Go program that prints "Hello, World!" and explain its parts.

Example:
<pre>package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}</pre>
- <code>package main</code>: declares this is an executable program
- <code>import "fmt"</code>: imports the package for printing
- <code>func main()</code>: the starting point of the program
- <code>fmt.Println</code>: prints the text to the screen

What keyword starts a Go program that can be run as an executable?

A start main

B func main

C import main

D package main

The keyword package main tells Go this program is executable and needs a main() function.

Where does the Go program begin execution?

A Inside the main() function

B At the package declaration

C At the first import statement

D At the last line of code

Execution starts inside the main() function.

What is the purpose of the import statement in Go?

A To include external packages for extra features

B To declare the program's package

C To start the program

D To define variables

Import statements bring in other packages that provide useful functions.

Which package is commonly imported to print output in Go?

A io

B os

C fmt

D net

The fmt package provides functions like Println to print text.

What happens if you omit the main() function in a Go program with package main?

A The program runs normally

B The program will not compile

C The program runs but does nothing

D The program prints an error at runtime

A program with package main must have a main() function or it will not compile.

Describe the main parts of a simple Go program and their roles.

Think about what tells Go this is an executable, what brings in extra features, and where the program starts.

Explain why the main() function is important in Go programs with package main.

Consider what happens when you run a Go program.