Address and dereference operators in Go - Mini Project: Build & Apply

Address and Dereference Operators

📖 Scenario: Imagine you are managing a simple inventory system where you need to update the quantity of an item using pointers. This helps you understand how to use address and dereference operators in Go.

🎯 Goal: You will create a variable for an item quantity, use a pointer to access its address, update the quantity through the pointer, and then print the updated quantity.

📋 What You'll Learn

Create an integer variable called quantity with the value 10.

Create a pointer variable called ptr that stores the address of quantity.

Use the dereference operator to update the value of quantity to 25 through the pointer ptr.

Print the updated value of quantity.

💡 Why This Matters

🌍 Real World

Pointers are used in real programs to efficiently update data without copying it, such as modifying inventory counts or managing resources.

💼 Career

Understanding pointers is important for system programming, performance optimization, and working with low-level data structures in Go.

1

Create the initial variable

Create an integer variable called quantity and set it to 10.

Go

// Create an integer variable called quantity and set it to 10
// Your code here

Hint

Use := to declare and assign the variable in one line.

2

Create a pointer to the variable

Create a pointer variable called ptr that stores the address of quantity using the address operator &.

Go

package main

func main() {
    quantity := 10
    // Create a pointer variable ptr that stores the address of quantity
    // Your code here
}

Hint

Use &quantity to get the address of quantity.

3

Update the variable using the pointer

Use the dereference operator * on ptr to update the value of quantity to 25.

Go

package main

func main() {
    quantity := 10
    ptr := &quantity
    // Update the value of quantity to 25 using the pointer ptr
    // Your code here
}

Hint

Use *ptr = 25 to change the value at the address stored in ptr.

4

Print the updated value

Use fmt.Println to print the updated value of quantity.

Go

package main

import "fmt"

func main() {
    quantity := 10
    ptr := &quantity
    *ptr = 25
    // Print the updated value of quantity
    // Your code here
}

Hint

Remember to import fmt and use fmt.Println(quantity) to display the value.