Arithmetic operators in Go - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of integer division and modulo

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    a := 17
    b := 5
    fmt.Println(a / b)
    fmt.Println(a % b)
}

A

3
-2

B

3.4
2

C

3
0

D

3
2

💡 Hint

Remember that integer division in Go truncates the decimal part.

In Go, dividing two integers results in integer division, so 17 / 5 equals 3. The modulo operator % gives the remainder, so 17 % 5 equals 2.

❓ Predict Output

intermediate

Output of mixed float and integer arithmetic

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    var x float64 = 7.5
    var y int = 2
    fmt.Println(x / float64(y))
}

A 3

B 3.5

C 3.75

D Compilation error

💡 Hint

You need to convert the integer to float64 before division.

Go does not allow direct arithmetic between different types. Converting y to float64 allows floating-point division, so 7.5 / 2.0 equals 3.75.

❓ Predict Output

advanced

Output of complex arithmetic expression

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    a := 10
    b := 3
    c := 4
    result := a - b*c + b/b
    fmt.Println(result)
}

A -1

B 1

C 4

D 7

💡 Hint

Remember operator precedence: multiplication and division before subtraction and addition.

Operator precedence: * and / first (left-to-right). b*c = 3*4 = 12, b/b = 3/3 = 1. Then - and + left-to-right: 10 - 12 + 1 = -1.

❓ Predict Output

advanced

Output of arithmetic with negative numbers

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    x := -15
    y := 4
    fmt.Println(x / y)
    fmt.Println(x % y)
}

A

-3
-1

B

-3
-3

C

-3
1

D

-4
1

💡 Hint

In Go, integer division truncates toward zero and modulo has the same sign as the dividend.

Integer division truncates toward zero: -15 / 4 = -3. Modulo sign matches dividend: -15 % 4 = -15 - (-3)*4 = -15 + 12 = -3.

❓ Predict Output

expert

Output of arithmetic with mixed types and constants

What is the output of this Go program?

Go

package main
import "fmt"
func main() {
    const a = 5
    var b float64 = 2.5
    c := a * int(b)
    fmt.Println(c)
}

A 12.5

B 10

C Compilation error

D 7

💡 Hint

You must convert float64 to int before multiplication with int constant.

The constant a is int 5, b is float64 2.5. Converting b to int truncates to 2, so c = 5 * 2 = 10.