Golang quiz

Please enter your name:

s := "hello"

result := len(s)

Select the "result" value:

package main

import “fmt”

func main() {

var a int8 = 3

var b int16 = 4

  sum := a + b
  fmt.Println(sum)

}

Invalid operation: a + b (mismatched types int8 and int16)

Does Go support optional parameters in functions?

Yes

On what data types you can use "for - range" statement?

Array, slice, map

Array, slice, map, string

Slice, map, string

Slice, map

package main

import “fmt”

func main() {

for I := 0; I < 4; i++ {

defer fmt.Print(i)

}

0123

3210

0000

3333

When will init() function be called?

A) Before main() function in main package

B) After importing a package with defined init() function

C) Only when you call it

A and b

Is it possible to declare multiple types of variables in single declaration in Go?

var a, b, c = 3, 4, “foo”

Yes

What’s the output of the following code?

package main

import "fmt"

const (
   a = iota
   b = iota
   c = iota
)

const (
   d, e, f = iota, iota, iota
)

func main() {

   fmt.Println(a, b, c, d, e, f)
   
}

0 1 2 3 4 5

0 1 2 0 1 2

0 1 2 0 0 0

0 0 0 0 1 2

s := "привет"

result := len(s)

Select the "result" value:

What's the default buffer size of the channel in Go?

No default size

What are the default values of these types: string,`*string` ?

"", nil

"", ""

Nil, nil

Nil, ""

Can short declaration ":=" be used for defining global variables?

Yes

Arrays are value types. In case of arrays perform as arguments, functions get their copies instead of a reference. Don’t they?

Yes

Which one of the following is correct?

A. const Pi = math.Pi

B. const Pi = 3.14

C. Both a and b are correct

D. None of the above

Which of the following variables are exportable from another external package?

package main

var (
    aName string
    BigBro string
    爱 string
)

func main()

AName, BigBro

BigBro

AName, BigBro, 爱

BigBro, 爱

What's the sequence for the output of the following code?

package main

import (
	"fmt"
	"sync"
)

func main() {
	var wg sync.WaitGroup

	wg.Add(1)
	go func() {
		fmt.Println("1")
		wg.Done()
	}()

        wg.Add(1)
	go func() {
		fmt.Println("2")
		wg.Done()
	}()

	wg.Wait()
	fmt.Println("3")
}

Always 1 2 3

Always 2 1 3

"1 2 3" or "2 1 3"

package main

import "fmt"

func main() {
	a := make([]int, 3, 4)
	a[0], a[1], a[2] = 0, 1, 2

	b := append(a, 66)
	b[0] = 6
	c := append(a, 77)
	c[0] = 7
	d := append(a, 88, 99)
	d[0] = 9

	//fmt.Println(a)
	fmt.Println(b)
	//fmt.Println(c)
	//fmt.Println(d)
}

Print b result?

6 1 2 66

7 1 2

7 1 2 77

9 1 2 88 99

Does this compile? Do you get a runtime panic? Do you get a value printed?

package main

import "fmt"

func main() {
	m := map[string]int{"one": 1, "two": 2, "three": 3}
	fmt.Println(m["four"])
}

Nil

Panic

Compile error

package main

func main() {

one := 0

one := 1

}

value of one?

Compile error

Nil

package main

import "fmt"

func main() {

x := 1

{

x := 2

}

fmt.Println(x)

}

print result?

Compile error

package main

import "fmt"

func main() {

x := "text"

x[0] = 'T'

fmt.Println(x)

}

print result?

Compile error

Text

Panic

package main

import "fmt"

func main() {

x := "text"

fmt.Println(x[0])

}

print result?

Text

Compile error

116

third := []string{"a", "b", "c", "d", "e", "f"}

for a, b := range third {

fmt.Println(a, b)

break

}

print result?

A a

A b

0 a

1 a

package main 

import "fmt"

var stuff = "not ready"

func init() {
  stuff = "ready"
}

func main() {
  fmt.Println("The stuff is", stuff)
}

print result?

The stuff is stuff

The stuff is ready

The stuff is not ready

Compile error

func sum(args ...int)  {
...
}

the args is type :

Int

[]interface{}

[]int

Interface{}

var a = [...]int {0,1,2,3,4,5,6,7}

var s = make([]int, 6) 
n1 := copy(s, a[0:])
n2 := copy(s, s[2:])

value of s ?

0, 1, 2, 3, 4, 5

0, 1, 2, 3, 4, 5, 6, 7

2,3,4,5

2, 3, 4, 5, 4, 5

package main

import "fmt"

type User struct {

    name  string
    age   int
}

func (u *User) Greeting() {
    fmt.Println("Hello I am user")
}

type Admin struct {

    User
    Level int
}

func (a *Admin) Greeting() {
    fmt.Println("Hello I am superuser")
}

func main() {
    a := Admin{}
    a.Greeting()
}

print result?

Hello I am user

Hello I am superuser

Compile error

Panic

package main

import "fmt"

func main() {
    var I interface{} = "hello"

    f = I.(float64)
    fmt.Println(f)
}

print result?

Compile error

Hello

342

Panic

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