200+ Golang Questions - Set 8 [With Solutions]

Golang Questions Set 8:

Quiz Mode

Golang Questions

Set 8/11

Which keyword is used to implement an interface in Go?

type

struct

interface

implements

What is the purpose of an empty interface in Go?

To define a generic type

To define a function type

To define a struct type

To define a pointer type

What is the output of the following code?
package main
import "fmt"

func main() {
var x []int
fmt.Println(len(x))
}

<nil>

Compilation error

Runtime error

What is the purpose of the "net.Conn" interface in Go?

To handle HTTP requests

To handle database queries

To handle network connections

To handle user authentication

What will be the output of the following code?
package main
import "fmt"
func main() {
  var x [3]int = [3]int{1, 2, 3}
  y := x
  y[1] = 4
  fmt.Println(x[1], y[1])
}

2 2

1 4

2 4

3 4

What is the purpose of the "sort.Interface" interface in Go?

To sort slices and arrays of values

To convert a value to a string representation

To handle user authentication

To handle file I/O operations

What is the purpose of the "fmt.Stringer" interface in Go?

To format strings in a specific way

To convert a value to a string representation

To read and write data to a file or network connection

To handle HTTP requests

Can a struct implement multiple interfaces in Go?

Yes, a struct can implement multiple interfaces

No, a struct can only implement one interface

It depends on the size of the struct

It depends on the number of methods in the interface

What will be the output of the following program?
package main

import (
"fmt"
)

func main() {
var x interface{} = 5
var y interface{} = "Hello"
fmt.Println(x.(int) + y.(string))
}

5Hello

Compilation error

Runtime error

The program will not compile as interface{} types cannot be used in expressions

Which of the following is not a valid way to implement an interface in Go?

Using a struct that defines all the methods in the interface

Using a pointer to a struct that defines all the methods in the interface

Using a type that defines all the methods in the interface

Using a function that defines all the methods in the interface

Quiz Mode

Qn. Sets

Golang Questions Set 8:

Golang Questions

Which keyword is used to implement an interface in Go?

Reveal Answer

Reveal Answer

What is the purpose of an empty interface in Go?

Reveal Answer

Reveal Answer

What is the output of the following code?package mainimport "fmt"func main() { var x []int fmt.Println(len(x))}

Reveal Answer

Reveal Answer

What is the purpose of the "net.Conn" interface in Go?

Reveal Answer

Reveal Answer

What will be the output of the following code?package mainimport "fmt"func main() { var x [3]int = [3]int{1, 2, 3} y := x y[1] = 4 fmt.Println(x[1], y[1])}

Reveal Answer

Reveal Answer

What is the purpose of the "sort.Interface" interface in Go?

Reveal Answer

Reveal Answer

What is the purpose of the "fmt.Stringer" interface in Go?

Reveal Answer

Reveal Answer

Can a struct implement multiple interfaces in Go?

Reveal Answer

Reveal Answer

What will be the output of the following program?package mainimport ( "fmt")func main() { var x interface{} = 5 var y interface{} = "Hello" fmt.Println(x.(int) + y.(string))}

Reveal Answer

Reveal Answer

Which of the following is not a valid way to implement an interface in Go?

Reveal Answer

Reveal Answer

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What is the output of the following code?
package main
import "fmt"

func main() {
var x []int
fmt.Println(len(x))
}

What will be the output of the following code?
package main
import "fmt"
func main() {
var x [3]int = [3]int{1, 2, 3}
y := x
y[1] = 4
fmt.Println(x[1], y[1])
}

What will be the output of the following program?
package main

import (
"fmt"
)

func main() {
var x interface{} = 5
var y interface{} = "Hello"
fmt.Println(x.(int) + y.(string))
}