Output using fmt.Print in Go - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Go code using fmt.Print?

Look at the code below. What will it print when run?

Go

package main
import "fmt"
func main() {
    fmt.Print("Hello")
    fmt.Print(" ")
    fmt.Print("World")
}

A Hello\nWorld

B Hello World\n

C Hello World

D HelloWorld\n

💡 Hint

fmt.Print prints exactly what you give it without adding new lines.

fmt.Print prints the strings one after another without adding spaces or new lines automatically. So the output is exactly "Hello World" with no new line.

❓ Predict Output

intermediate

What does this Go code print with fmt.Print and fmt.Println?

Check the output of this program:

Go

package main
import "fmt"
func main() {
    fmt.Print("Go")
    fmt.Println("Lang")
    fmt.Print("!\n")
}

A

GoLang

B

!
gnaLoG

C

oLang
!

D

GoLang
!

💡 Hint

fmt.Println adds a new line after printing, fmt.Print does not.

fmt.Print("Go") prints Go with no new line. fmt.Println("Lang") prints Lang and adds a new line. fmt.Print("!\n") prints ! and a new line. So output is GoLang\n!\n

❓ Predict Output

advanced

What is the output of this Go code using fmt.Print with variables?

What will this program print?

Go

package main
import "fmt"
func main() {
    a := 5
    b := 10
    fmt.Print("Sum: ", a+b)
}

A Sum: a+b

B Sum: 15

C Sum: 510

D Sum: 5+10

💡 Hint

The + operator adds numbers, not strings, when used with integers.

a and b are integers 5 and 10. a+b is 15. fmt.Print prints "Sum: " then 15, so output is "Sum: 15".

❓ Predict Output

advanced

What error does this Go code produce?

What happens when you run this code?

Go

package main
import "fmt"
func main() {
    fmt.Print("Number: " + 5)
}

A compile error: invalid operation: mismatched types string and int

B Number: 5\n

C Number: 5

D runtime error

💡 Hint

You cannot add a string and an int directly in Go.

In Go, you cannot use + to add a string and an int directly. This causes a compile error about mismatched types.

🧠 Conceptual

expert

How many characters are printed by this Go program using fmt.Print?

Count the total characters printed by this program:

Go

package main
import "fmt"
func main() {
    fmt.Print("Go")
    fmt.Print(" ")
    fmt.Print(123)
}

A 6

B 5

C 7

D 8

💡 Hint

Remember numbers printed by fmt.Print are converted to their string form.

fmt.Print("Go") prints 2 chars, fmt.Print(" ") prints 1 char, fmt.Print(123) prints 3 chars (digits). Total 2+1+3=6 characters.