Golang quiz
s := "hello"
result := len(s)
Select the "result" value:
1
5
10
20
package main
import “fmt”
func main() {
var a int8 = 3
var b int16 = 4
sum := a + b
fmt.Println(sum)
}
7
4
3
Invalid operation: a + b (mismatched types int8 and int16)
Does Go support optional parameters in functions?
Yes
No
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
No
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:
1
6
12
24
What's the default buffer size of the channel in Go?
0
1
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
No
Arrays are value types. In case of arrays perform as arguments, functions get their copies instead of a reference. Don’t they?
Yes
No
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
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
0
Panic
Compile error
package main
func main() {
one := 0
one := 1
}
value of one?
0
1
Compile error
Nil
package main
import "fmt"
func main() {
x := 1
{
x := 2
}
fmt.Println(x)
}
print result?
1
2
Compile error
0
package main
import "fmt"
func main() {
x := "text"
x[0] = 'T'
fmt.Println(x)
}
print result?
Compile error
Text
Text
Panic
package main
import "fmt"
func main() {
x := "text"
fmt.Println(x[0])
}
print result?
Text
Compile error
T
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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