Address and dereference operators in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the address of variable num.

Go

num := 10
ptr := [1]num
fmt.Println(ptr)

Drag options to blanks, or click blank then click option'

A*

B&

C#

D$

Attempts:

3 left

💡 Hint

Common Mistakes

Using the dereference operator * instead of the address operator &.

Using symbols like # or $ which are not valid operators.

The address operator in Go is &. It returns the memory address of the variable.

2fill in blank

medium

Complete the code to access the value stored at the pointer ptr.

Go

num := 20
ptr := &num
value := [1]ptr
fmt.Println(value)

Drag options to blanks, or click blank then click option'

A*

B&

C^

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Using the address operator & instead of dereference *.

Using invalid operators like ^ or %.

The dereference operator * is used to access the value stored at the memory address a pointer holds.

3fill in blank

hard

Fix the error in the code to correctly update the value via pointer.

Go

num := 5
ptr := &num
[1]ptr = 10
fmt.Println(num)

Drag options to blanks, or click blank then click option'

Aptr*

Bptr

C*

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning directly to the pointer variable instead of dereferencing it.

Using invalid syntax like ptr* or &ptr.

To update the value that a pointer points to, use the dereference operator * before the pointer variable.

4fill in blank

hard

Fill both blanks to create a pointer to val and then get its value.

Go

val := 15
ptr := [1]val
result := [2]ptr
fmt.Println(result)

Drag options to blanks, or click blank then click option'

A&

B*

C#

D$

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the operators in the blanks.

Using invalid operators like # or $.

First, use & to get the address of val. Then use * to dereference the pointer and get the value.

5fill in blank

hard

Fill all three blanks to create a pointer, update the value via pointer, and print the updated value.

Go

num := 8
ptr := [1]num
[2]ptr = 20
fmt.Println([3]ptr)

Drag options to blanks, or click blank then click option'

A&

B*

Cptr

Dnum

Attempts:

3 left

💡 Hint

Common Mistakes

Using the pointer variable ptr directly instead of dereferencing.

Mixing up the address and dereference operators.

Use & to get the address of num. Use *ptr to update and access the value via the pointer.