Understanding Swift Variables and Scope

What is a variable in Swift?

• A constant value that cannot be changed

• A named storage that can hold a value

• A function that performs a specific task

• A type of loop used in programming

Which of the following is a correct way to declare a variable in Swift?

• `let age = 25`

• `var name = "John"`

• `int height = 180`

• `string city = "New York"`

What is the difference between `let` and `var` in Swift?

• `let` is used for loops, `var` is used for functions

• `let` declares a constant, `var` declares a variable

• `let` is used for strings, `var` is used for integers

• `let` is used for global scope, `var` is used for local scope

Which of the following is a global variable?

• A variable declared inside a function

• A variable declared outside all functions

• A variable declared inside a loop

• A variable declared inside a conditional statement

What is the scope of a local variable?

• It can be accessed from anywhere in the program

• It can only be accessed within the block where it is declared

• It can be accessed by all functions in the program

• It can be accessed by all classes in the program

Which of the following is a correct data type in Swift?

• `integer`

• `float`

• `Int`

• `double`

What will be the output of the following Swift code? ```swift var x = 10 x = 20 print(x) ```

• 10

• 20

• 30

• Error

Which of the following statements about variable state is true?

• A variable's state cannot change during program execution

• A variable's state is its current value at any point in time

• A variable's state is determined by its data type

• A variable's state is always initialized to zero

What is the result of the following Swift code? ```swift let pi = 3.14 pi = 3.14159 ```

• 3.14

• 3.14159

• Error

• 0