Output formatting basics in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a formatted string with a name.

Go

package main
import "fmt"
func main() {
    name := "Alice"
    fmt.Printf("Hello, [1]!\n", name)
}

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

A"%v"

B"%d"

C"%f"

D"%s"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %d instead of %s causes wrong output or errors.

Forgetting to include quotes around the format specifier.

The %s verb formats a string in Go's fmt.Printf function.

2fill in blank

medium

Complete the code to print a floating-point number with two decimal places.

Go

package main
import "fmt"
func main() {
    pi := 3.14159
    fmt.Printf("Pi is approximately [1]\n", pi)
}

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

A"%.2f"

B"%d"

C"%s"

D"%v"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %d for floats causes wrong output.

Using %s prints the float as a string, not formatted.

The %.2f verb formats a float with two decimal places.

3fill in blank

hard

Fix the error in the code to print an integer with leading zeros to make it 5 digits.

Go

package main
import "fmt"
func main() {
    num := 42
    fmt.Printf("Number: [1]\n", num)
}

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

A"%05d"

B"%5d"

C"%d"

D"%f"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %5d pads with spaces, not zeros.

Using %f for integers causes errors.

The %05d verb prints an integer padded with zeros to width 5.

4fill in blank

hard

Fill both blanks to print a string left-aligned in a 10-character wide field and an integer right-aligned in a 5-character wide field.

Go

package main
import "fmt"
func main() {
    name := "Bob"
    age := 30
    fmt.Printf("Name: [1] Age: [2]\n", name, age)
}

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

A"%-10s"

B"%10s"

C"%5d"

D"%-5d"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %10s for string aligns right, not left.

Using %-5d left-aligns integer, but question wants right-aligned.

Use %-10s for left-aligned string in 10 spaces and %5d for right-aligned integer in 5 spaces.

5fill in blank

hard

Fill all three blanks to print a float with 3 decimals, a string right-aligned in 8 spaces, and an integer padded with zeros to 4 digits.

Go

package main
import "fmt"
func main() {
    price := 9.87654
    product := "Pen"
    code := 7
    fmt.Printf("Price: [1] Product: [2] Code: [3]\n", price, product, code)
}

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

A"%.3f"

B"%8s"

C"%04d"

D"%-8s"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %s without width does not align string.

Using %d without zero padding for code.

Use %.3f for float with 3 decimals, %8s for right-aligned string in 8 spaces, and %04d for zero-padded 4-digit integer.