Assignment operators in Go - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of compound assignment with addition

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    x := 10
    x += 5
    fmt.Println(x)
}

A Compilation error

B 10

C 5

D 15

💡 Hint

The += operator adds the right value to the left variable.

The operator x += 5 adds 5 to x, so x becomes 15.

❓ Predict Output

intermediate

Output of compound assignment with bitwise AND

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    a := 12  // binary 1100
    a &= 5  // binary 0101
    fmt.Println(a)
}

A 4

B 5

C 12

D 8

💡 Hint

Bitwise AND keeps bits set in both numbers.

12 (1100) & 5 (0101) = 4 (0100).

❓ Predict Output

advanced

Value after multiple compound assignments

What is the value of variable x after running this Go code?

Go

package main
import "fmt"
func main() {
    x := 3
    x *= 4
    x -= 5
    x /= 2
    fmt.Println(x)
}

A 3

B 1

C 4

D 2

💡 Hint

Apply each operation step by step.

x starts at 3, then x *= 4 → 12, x -= 5 → 7, x /= 2 → 3 (integer division), but Go integer division truncates so 7/2=3, so output is 3.

❓ Predict Output

advanced

Output of compound assignment with string concatenation

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    s := "Go"
    s += "lang"
    fmt.Println(s)
}

A Compilation error

B Golang

C Go+lang

D Go lang

💡 Hint

The += operator concatenates strings in Go.

The string s is "Go" and += "lang" appends "lang" to it, resulting in "Golang".

❓ Predict Output

expert

Output of compound assignment with float division and type conversion

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    var x float64 = 10.0
    var y int = 4
    x /= float64(y)
    fmt.Printf("%.2f", x)
}

A 2

B 2.5

C 2.50

D Compilation error

💡 Hint

Remember to convert int to float64 before division.

x is 10.0, y is 4. After x /= float64(y), x becomes 2.5. The Printf formats it to 2 decimal places: 2.50.