Function execution flow in Go - Mini Project: Build & Apply

Function Execution Flow in Go

📖 Scenario: Imagine you are building a simple calculator program in Go that adds two numbers. You want to understand how functions work and how the program runs step-by-step.

🎯 Goal: You will create a function to add two numbers, call it from the main function, and print the result. This will help you learn how function execution flows in Go.

📋 What You'll Learn

Create a function named add that takes two integers and returns their sum.

Call the add function from main with specific numbers.

Store the result in a variable named result.

Print the value of result.

💡 Why This Matters

🌍 Real World

Functions help organize code into reusable blocks, like a calculator's add button.

💼 Career

Understanding function flow is essential for writing clear and maintainable Go programs in software development.

1

Create the main function

Write the main function with an empty body. This is where the program starts running.

Go

func main() {
    // Your code here
}

Hint

The main function is the entry point of a Go program.

2

Create the add function

Create a function named add that takes two int parameters named a and b, and returns their sum as an int.

Go

package main

func main() {
    // Program starts here
}

// Your code here

Hint

Functions in Go start with func, followed by the name, parameters, and return type.

3

Call add and store the result

Inside the main function, call the add function with arguments 5 and 7. Store the returned value in a variable named result.

Go

package main

func main() {
    // Call add function and store result
    // Your code here
}

func add(a int, b int) int {
    return a + b
}

Hint

Use := to declare and assign a variable in Go.

4

Print the result

Add a fmt.Println statement inside main to print the value of result. Remember to import the fmt package at the top.

Go

package main

// Import fmt package

func main() {
    result := add(5, 7)
    // Print the result
    // Your code here
}

func add(a int, b int) int {
    return a + b
}

Hint

Use fmt.Println(result) to print the value. Don't forget to import fmt.