Why input and output are required in Go - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read a number from the user.

Go

var num int
fmt.Scanln([1])

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

Anum&

Bnum

C*num

D&num

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the variable without & causes runtime error.

Using *num is invalid syntax for input.

In Go, to read input into a variable, you must pass its address using &.

2fill in blank

medium

Complete the code to print the value of num.

Go

fmt.Println([1])

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

Anum&

Bnum

C*num

D&num

Attempts:

3 left

💡 Hint

Common Mistakes

Using &num prints the memory address, not the value.

Using *num causes error unless num is a pointer.

To print a variable's value, just use the variable name without &.

3fill in blank

hard

Fix the error in reading input into variable x.

Go

var x int
fmt.Scanln([1])

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

A&x

Bx&

C*x

Dx

Attempts:

3 left

💡 Hint

Common Mistakes

Passing x instead of &x causes input to fail.

Using *x is invalid because x is not a pointer.

Input functions need the address of the variable to store the input.

4fill in blank

hard

Fill both blanks to create a program that reads and prints a string.

Go

var input string
fmt.Scanln([1])
fmt.Println([2])

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

A&input

Binput

Cinput&

D*input

Attempts:

3 left

💡 Hint

Common Mistakes

Using input instead of &input for reading input.

Using &input when printing prints the address.

Use &input to read input and input to print the value.

5fill in blank

hard

Fill all three blanks to read two integers and print their sum.

Go

var a, b int
fmt.Scanln([1], [2])
sum := [3]
fmt.Println(sum)

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

A&a

B&b

Ca + b

Da - b

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a and b instead of &a and &b to Scanln.

Using subtraction instead of addition for sum.

Use &a and &b to read inputs, then add a and b for the sum.