[Author: @mdimamhosen Date: 2025-04-19 Category: interview-qa/operators Tags: [go, operators, arithmetic, assignment] ]

Operators are used to perform operations on variables and values

Arithmetic Operators

1. Addition: The + operator adds two operands. For example, x+y.

2. Subtraction: The - operator subtracts two operands. For example, x-y.

3. Multiplication: The * operator multiplies two operands. For example, x*y.

4. Division: The / operator divides the first operand by the second. For example, x/y.

5. Modulus: Returns the division remainder

6. Increment: The ++ Increases the value of a variable by 1

7. Decrement: The -- Decreases the value of a variable by 1

package main
import "fmt"

func main() {
	fmt.Println(2 + 2) // 4
	fmt.Println(2 - 2) // 0
	fmt.Println(2 * 2) // 4
	fmt.Println(2 / 2) // 1
	fmt.Println(2 % 2) // 0
}

Increment

package main
import ("fmt")

func main() {
  x:= 10
  x++ // Add one new value (increment)
  fmt.Println(x)
}

Decrement

package main
import ("fmt")

func main() {
  x:= 10
  x-- // Remove one new value (decrement)
  fmt.Println(x)
}

Assignment Operators

Assignment operators are used to assign values to variables.

Questions and Examples

1. Create a variable named lgNumber, store 1000 as a value, and perform various operations.

package main
import ("fmt")

func main() {
  lgNumber := 1000

  // Add that variable with itself
  sum := lgNumber + lgNumber
  fmt.Println("Addition:", sum) // 2000

  // Subtract that variable by itself
  difference := lgNumber - lgNumber
  fmt.Println("Subtraction:", difference) // 0

  // Multiply that variable with itself
  product := lgNumber * lgNumber
  fmt.Println("Multiplication:", product) // 1000000

  // Divide that variable with itself
  quotient := lgNumber / lgNumber
  fmt.Println("Division:", quotient) // 1
}

Frequently Asked Questions

1. How do you perform addition and subtraction in Go?

Answer: Use the + operator for addition and - for subtraction.

package main
import "fmt"

func main() {
    a, b := 10, 5
    fmt.Println("Addition:", a+b) // 15
    fmt.Println("Subtraction:", a-b) // 5
}

2. How do you calculate the remainder of a division in Go?

Answer: Use the % operator for modulus.

package main
import "fmt"

func main() {
    fmt.Println("Remainder:", 10%3) // 1
}

3. Can you increment a variable in Go?

Answer: Yes, use ++ to increment a variable by 1.

package main
import "fmt"

func main() {
    x := 5
    x++
    fmt.Println("Incremented Value:", x) // 6
}

4. How do you assign and add a value to a variable in Go?

Answer: Use the += operator.

package main
import "fmt"

func main() {
    x := 10
    x += 5
    fmt.Println("Updated Value:", x) // 15
}

5. How do you multiply and assign a value to a variable in Go?

Answer: Use the *= operator.

package main
import "fmt"

func main() {
    x := 10
    x *= 2
    fmt.Println("Updated Value:", x) // 20
}

6. How do you divide and assign a value to a variable in Go?

Answer: Use the /= operator.

package main
import "fmt"

func main() {
    x := 10
    x /= 2
    fmt.Println("Updated Value:", x) // 5
}

7. How do you decrement a variable in Go?

Answer: Use -- to decrement a variable by 1.

package main
import "fmt"

func main() {
    x := 5
    x--
    fmt.Println("Decremented Value:", x) // 4
}

8. How do you perform multiple arithmetic operations in one line?

Answer: Combine operators in a single expression.

package main
import "fmt"

func main() {
    result := (10 + 5) * 2 - 3
    fmt.Println("Result:", result) // 27
}

9. How do you check if a number is even or odd in Go?

Answer: Use the modulus operator %.

package main
import "fmt"

func main() {
    num := 7
    if num%2 == 0 {
        fmt.Println("Even")
    } else {
        fmt.Println("Odd")
    }
}

10. How do you swap two numbers without using a third variable in Go?

Answer: Use arithmetic operations.

package main
import "fmt"

func main() {
    a, b := 5, 10
    a = a + b
    b = a - b
    a = a - b
    fmt.Println("Swapped Values:", a, b) // 10, 5
}