Variablels

Question 1

Declare a variable in go

Answer 1

use keyword “var” followed by “name” followed by “type”

e.g. var myString string

Question 2

End of statement in go-lang

Answer 2

1. By using new line character

2. By using semicolon

Question 3

Declare variable with datatype

Answer 3

var myVar string = “asdfa”

Question 4

Declare variable without datatype

Answer 4

var myVar = "stasdf"
// here the type is identified using the literal

Question 5

Declare variable without var keyword

Answer 5

myVar := "asdf"
// here the type is identified using the literal

Question 6

What is lexical scoping of variables in Go?

Answer 6

It means, the variable can be accessed only inside the curly braces where it was declared.

Question 7

is it going to work?
myVar := "asd"
func main(){
    fmt.Println("hello world" + myVar)
}

Answer 7

No, outside the body function, only “non-declarative” statements are allowed.

Question 8

What is created here?

const myVar string = “asdfasf”

Answer 8

We created a constant here.

Question 9

Is there any difference between scoping of a constant and a variable?

Answer 9

No, there is no difference between them.

Question 10

Is it correct syntax?

var ( a = 23; b = “asd”; c= 234.23)

Answer 10

Yes, here we are creating multiple variables using single var keyword

Question 11

What this function will do?

fmt.Scanf()

Answer 11

This will read input from standard inputs.

Question 12

How many loops are there in Go-lang?

Answer 12

Only one, for loop

Question 13

Syntax of for loop?

Answer 13

for  {
  // all codes goes here
}

Question 14

Is it necessary to provide for expression inside a parenthesis?

Answer 14

No

Question 15

Syntax of if-else

Answer 15

if  {
 // if block
} else {
 // else block
}

Question 16

What is wrong here
if x == 5
fmt.Println(“5 is incorrect”)

Answer 16

After If statement, curly braces are mandatory

Question 17

What is wrong here
if x==5 {
// if block
}
else {
// else block
}

Answer 17

The else statement must be started where “if” ends.

Question 18

Switch case syntax in go lang

Answer 18

switch {
case 0 :

case 1:

}

Question 19

Is it mandatory to use “break” statement in switch-case

Answer 19

No