[Solved] You want a Swift program that prints "Access Granted" only if a Boolean flag is true at startup. Using @main, which implementation is correct? | Swift

Swift - Basics and Runtime

You want a Swift program that prints "Access Granted" only if a Boolean flag is true at startup. Using @main, which implementation is correct?

A

<pre>@main struct AccessControl {
    func main() {
        if isAllowed {
            print("Access Granted")
        }
    }
    let isAllowed = true
}</pre>

B

<pre>@main struct AccessControl {
    static let isAllowed = true
    static func main() {
        if isAllowed {
            print("Access Granted")
        }
    }
}</pre>

C

<pre>@main class AccessControl {
    static func main() {
        print("Access Granted")
    }
}</pre>

D

<pre>struct AccessControl {
    static func main() {
        if isAllowed {
            print("Access Granted")
        }
    }
    static let isAllowed = true
}</pre>

Step-by-Step Solution

Solution:

Step 1: Confirm @main usage
The type must be marked with @main and contain a static main() method.

Step 2: Check condition and print

@main struct AccessControl {
    static let isAllowed = true
    static func main() {
        if isAllowed {
            print("Access Granted")
        }
    }
}

correctly uses a static property and static main() to conditionally print.

Step 3: Eliminate incorrect options

@main struct AccessControl {
    func main() {
        if isAllowed {
            print("Access Granted")
        }
    }
    let isAllowed = true
}

uses instance main(), invalid with @main.

@main class AccessControl {
    static func main() {
        print("Access Granted")
    }
}

always prints unconditionally.

struct AccessControl {
    static func main() {
        if isAllowed {
            print("Access Granted")
        }
    }
    static let isAllowed = true
}

lacks @main attribute.

Final Answer:

@main struct AccessControl { static let isAllowed = true static func main() { if isAllowed { print("Access Granted") } } }
is correct.

Quick Check:
@main type with static main() and static flag [OK]

Quick Trick: Use static main() and static flag inside @main type [OK]

Common Mistakes:

Declaring main() as instance method
Omitting @main attribute
Ignoring conditional logic in main()

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More Swift Quizzes

You want a Swift program that prints "Access Granted" only if a Boolean flag is true at startup. Using @main, which implementation is correct?

Step 1: Confirm @main usage

Step 2: Check condition and print

Step 3: Eliminate incorrect options

Final Answer:

Quick Check:

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