Return values in Go - Mini Project: Build & Apply

Return values

📖 Scenario: You are creating a simple calculator program in Go. You want to write a function that adds two numbers and returns the result.

🎯 Goal: Build a Go program with a function that takes two numbers, adds them, and returns the sum. Then print the returned result.

📋 What You'll Learn

Create a function called add that takes two int parameters and returns an int

Call the add function with two numbers

Store the returned value in a variable

Print the stored result

💡 Why This Matters

🌍 Real World

Functions that return values are used everywhere in programming to get results from calculations or data processing.

💼 Career

Understanding return values is essential for writing reusable code and building programs that perform tasks and give back results.

1

Create the add function

Write a function called add that takes two int parameters named a and b and returns their sum as an int. The function should return a + b.

Go

package main

func add(a int, b int) int {
    // Your code here
}

func main() {

}

Hint

Use the return keyword to send back the sum of a and b.

2

Call the add function and store the result

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

Go

package main

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

func main() {
    // Your code here
}

Hint

Use := to declare and assign result in one step.

3

Print the result

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

Go

package main

import "fmt"

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

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

Hint

Use fmt.Println(result) to show the sum on the screen.

4

Run the program to see the output

Run the program. It should print the sum of 5 and 7, which is 12.

Go

package main

import "fmt"

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

func main() {
    result := add(5, 7)
    fmt.Println(result)
    // Your code here
}

Hint

Check the terminal or console output. It should show 12.