Why pointers are needed in Go - See It in Action

Why pointers are needed

📖 Scenario: Imagine you have a list of boxes, each with a number inside. You want to change the number inside a box without making a copy of the box. This is like using pointers in Go.

🎯 Goal: You will create a simple Go program that shows how pointers let you change the original value of a variable by using its address.

📋 What You'll Learn

Create an integer variable called number with the value 10

Create a pointer variable called ptr that points to number

Change the value of number through the pointer ptr to 20

Print the value of number to show it has changed

💡 Why This Matters

🌍 Real World

Pointers are used in real programs to efficiently update data without copying it, like changing settings or updating large data structures.

💼 Career

Understanding pointers is important for Go developers to write efficient and clear code, especially when working with functions, data structures, and system programming.

1

Create an integer variable

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

Go

package main

func main() {
    // Create an integer variable called number and set it to 10
    // Your code here
}

Hint

Use := to create and set the variable in one line.

2

Create a pointer to the variable

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

Go

package main

func main() {
    number := 10
    // Create a pointer variable ptr that points to number
    // Your code here
}

Hint

Use &number to get the address of the variable number.

3

Change the value using the pointer

Use the pointer ptr to change the value of number to 20. Use the * operator to access the value at the pointer.

Go

package main

func main() {
    number := 10
    ptr := &number
    // Change the value of number to 20 using ptr
    // Your code here
}

Hint

Use *ptr = 20 to set the value at the address stored in ptr.

4

Print the changed value

Print the value of number using fmt.Println(number) to show it has changed to 20. Remember to import fmt.

Go

package main

import "fmt"

func main() {
    number := 10
    ptr := &number
    *ptr = 20
    // Print the value of number
    // Your code here
}

Hint

Use fmt.Println(number) to print the value.