Function declaration in Go - Mini Project: Build & Apply

Function declaration

📖 Scenario: You are creating a simple calculator program in Go that can add two numbers.

🎯 Goal: Build a Go program that declares a function to add two integers and then uses it to show the result.

📋 What You'll Learn

Declare a function named add that takes two int parameters and returns their sum as int.

Call the add function with two numbers.

Print the result of the addition.

💡 Why This Matters

🌍 Real World

Functions help organize code into reusable blocks, just like recipes in cooking. You can use them to perform tasks many times without rewriting code.

💼 Career

Knowing how to declare and use functions is essential for any software developer. It helps write clean, maintainable, and reusable code.

1

Create two integer variables

Create two integer variables called a and b with values 5 and 7 respectively.

Go

package main

import "fmt"

func main() {
    // Create two integer variables a and b with values 5 and 7
    // Your code here
}

Hint

Use := to declare and assign variables in Go.

2

Declare the add function

Declare a function named add that takes two int parameters named x and y and returns their sum as int.

Go

package main

import "fmt"

func add(x int, y int) int {
    // Your code here
}

func main() {
    a := 5
    b := 7
}

Hint

Use func add(x int, y int) int to declare the function and return x + y to return the sum.

3

Call the add function

Inside main, call the add function with a and b and store the result in a variable called result.

Go

package main

import "fmt"

func add(x int, y int) int {
    return x + y
}

func main() {
    a := 5
    b := 7
    // Call add with a and b, store in result
    // Your code here
}

Hint

Use result := add(a, b) to call the function and save the sum.

4

Print the result

Print the value of the variable result using fmt.Println.

Go

package main

import "fmt"

func add(x int, y int) int {
    return x + y
}

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

Hint

Use fmt.Println(result) to print the sum.