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Golang Questions Set 20:

Quiz Mode

Which keyword is used in Go to implement interfaces?

interface

implements

extends

implementsInterface

Solution:

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

func main() {
a := make([]int, 3, 6)
fmt.Println(len(a))
}

Solution:

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

func main() {
  a := []int{1, 2, 3}
  b := []int{4, 5, 6}
  a = append(a, b...)
  fmt.Println(a)
}

[1, 2, 3]

[1, 2, 3, 4, 5, 6]

[4, 5, 6]

[4, 5, 6, 1, 2, 3]

Solution:

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

func main() {
   a := []int{1, 2, 3}
   b := []int{4, 5, 6}
   copy(a, b)
   fmt.Println(a, b)
}

[4 5 6] [4 5 6]

[1 2 3] [4 5 6]

[4 5 6] [1 2 3]

Compilation error

Solution:

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

type myInt int

func (mi myInt) double() {
   mi *= 2
}

func main() {
   mi := myInt(2)
   mi.double()
   fmt.Println(mi)
}

Compilation error

Runtime error

Solution:

What is an anonymous field in Go?

A field of a struct that has no name.

A field of a struct that is inherited from another struct.

A field of a struct that is defined in a different package.

A field of a struct that has no type.

Solution:

Which of the following is true about Go's interfaces?

Go interfaces can contain both method declarations and field declarations.

A Go struct can implement multiple interfaces.

A Go interface can only be implemented by a struct.

A Go interface can have fields in addition to methods.

Solution:

What is a pointer receiver in Go?

A method receiver that operates on a copy of the value.

A method receiver that operates on the original value.

A method receiver that operates on a pointer to the original value.

A method receiver that operates on a reference to the original value.

Solution:

Define a struct called "Rectangle" with properties "length" and "width". Create a method called "area" that returns the area of the rectangle. Implement this method using pointer receivers.

type Rectangle struct {

length float64

width float64

}

func (r *Rectangle) area() float64 {

return r.length * r.width

}

type Rectangle struct {

length float64

width float64

}

func (r Rectangle) area() float64 {

return r.length * r.width

}

type Rectangle struct {

Length float64

Width float64

}

func (r *Rectangle) area() float64 {

return r.Length * r.Width

}

type Rectangle struct {

Length float64

Width float64

}

func (r Rectangle) area() float64 {

return r.Length * r.Width

}

Solution:

Define a struct called "Person" with properties "name" and "age". Create a method called "greet" that takes no arguments and returns a string. The string should say "Hello, my name is [name] and I am [age] years old." Implement this method using value receivers.

type Person struct {

name string

age int

}

func (p Person) greet() string {

return fmt.Sprintf("Hello, my name is %s and I am %d years old.", p.name, p.age)

}

type Person struct {

Name string

Age int

}

func (p Person) greet() string {

return fmt.Sprintf("Hello, my name is %s and I am %d years old.", p.Name, p.Age)

}

type Person struct {

name string

age int

}

func (p *Person) greet() string {

return fmt.Sprintf("Hello, my name is %s and I am %d years old.", p.name, p.age)

}

type Person struct {

Name string

Age int

}

func (p *Person) greet() string {

return fmt.Sprintf("Hello, my name is %s and I am %d years old.", p.Name, p.Age)

}

Solution:

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Golang Questions Set 20:

Which keyword is used in Go to implement interfaces?

Solution:

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

func main() {
a := make([]int, 3, 6)
fmt.Println(len(a))
}

Solution:

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

func main() {
  a := []int{1, 2, 3}
  b := []int{4, 5, 6}
  a = append(a, b...)
  fmt.Println(a)
}

Solution:

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

func main() {
   a := []int{1, 2, 3}
   b := []int{4, 5, 6}
   copy(a, b)
   fmt.Println(a, b)
}

Solution:

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

type myInt int

func (mi myInt) double() {
   mi *= 2
}

func main() {
   mi := myInt(2)
   mi.double()
   fmt.Println(mi)
}

Solution:

What is an anonymous field in Go?

Solution:

Which of the following is true about Go's interfaces?

Solution:

What is a pointer receiver in Go?

Solution:

Define a struct called "Rectangle" with properties "length" and "width". Create a method called "area" that returns the area of the rectangle. Implement this method using pointer receivers.

Solution:

Define a struct called "Person" with properties "name" and "age". Create a method called "greet" that takes no arguments and returns a string. The string should say "Hello, my name is [name] and I am [age] years old." Implement this method using value receivers.

Solution:

Related Question Sets:

Related Topics:

Golang Questions Set 20:

Which keyword is used in Go to implement interfaces?

Solution:

What is the output of the following code?﻿package mainimport "fmt"func main() { a := make([]int, 3, 6) fmt.Println(len(a))}

Solution:

What is the output of the following code?package mainimport "fmt"func main() { a := []int{1, 2, 3} b := []int{4, 5, 6} a = append(a, b...) fmt.Println(a)}

Solution:

What is the output of the following code?package mainimport "fmt"func main() { a := []int{1, 2, 3} b := []int{4, 5, 6} copy(a, b) fmt.Println(a, b)}

Solution:

What is the output of the following code?goCopy codepackage mainimport "fmt"type myInt intfunc (mi myInt) double() { mi *= 2}func main() { mi := myInt(2) mi.double() fmt.Println(mi)}

Solution:

What is an anonymous field in Go?

Solution:

Which of the following is true about Go's interfaces?

Solution:

What is a pointer receiver in Go?

Solution:

Define a struct called "Rectangle" with properties "length" and "width". Create a method called "area" that returns the area of the rectangle. Implement this method using pointer receivers.

Solution:

Define a struct called "Person" with properties "name" and "age". Create a method called "greet" that takes no arguments and returns a string. The string should say "Hello, my name is [name] and I am [age] years old." Implement this method using value receivers.

Solution:

Related Question Sets:

Related Topics:

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

func main() {
a := make([]int, 3, 6)
fmt.Println(len(a))
}

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

func main() {
a := []int{1, 2, 3}
b := []int{4, 5, 6}
a = append(a, b...)
fmt.Println(a)
}

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

func main() {
a := []int{1, 2, 3}
b := []int{4, 5, 6}
copy(a, b)
fmt.Println(a, b)
}

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

type myInt int

func (mi myInt) double() {
mi *= 2
}

func main() {
mi := myInt(2)
mi.double()
fmt.Println(mi)
}