Operator precedence in Go - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Go code involving mixed operators?

Consider the following Go code snippet. What will it print?

Go

package main
import "fmt"
func main() {
    result := 3 + 4*2
    fmt.Println(result)
}

A 14

B 11

C 10

D 7

💡 Hint

Remember that multiplication (*) has higher precedence than addition (+).

Multiplication happens before addition, so 4*2 = 8, then 3 + 8 = 11.

❓ Predict Output

intermediate

What is the output of this Go code with parentheses changing precedence?

What will this Go program print?

Go

package main
import "fmt"
func main() {
    result := (3 + 4) * 2
    fmt.Println(result)
}

A 14

B 7

C 10

D 11

💡 Hint

Parentheses change the order of operations.

Parentheses force addition first: (3 + 4) = 7, then multiply by 2 = 14.

❓ Predict Output

advanced

What is the output of this Go code with mixed logical and comparison operators?

What will this Go program print?

Go

package main
import "fmt"
func main() {
    a := 5
    b := 10
    c := 15
    result := a < b && b > c || c == 15
    fmt.Println(result)
}

A true

B false

C compile error

D panic

💡 Hint

Logical AND (&&) has higher precedence than logical OR (||).

Evaluate a < b && b > c first: 5 < 10 is true, 10 > 15 is false, so true && false = false.
Then false || c == 15: c == 15 is true, so false || true = true.

❓ Predict Output

advanced

What is the output of this Go code with bitwise and arithmetic operators?

What will this Go program print?

Go

package main
import "fmt"
func main() {
    x := 6  // binary 110
    y := 3  // binary 011
    result := x & y + 2
    fmt.Println(result)
}

A 2

B 6

C 4

D 0

💡 Hint

Bitwise AND (&) has higher precedence than addition (+).

First compute x & y: 6 & 3 = 2 (binary 110 & 011 = 010). Then add 2: 2 + 2 = 4.

❓ Predict Output

expert

What is the output of this Go code with mixed assignment and arithmetic operators?

What will this Go program print?

Go

package main
import "fmt"
func main() {
    a := 10
    b := 5
    a += b * 2
    fmt.Println(a)
}

A 25

B 30

C 15

D 20

💡 Hint

Multiplication happens before the addition assignment.

b * 2 is evaluated first: 5 * 2 = 10. Then a += 10 means a = a + 10 = 10 + 10 = 20.