Internet of Things (IoT) Practice Exam

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Prepare for your Internet of Things (IoT) Exam with engaging quizzes. Study IoT concepts through flashcards and multiple-choice questions, complete with hints and explanations. Master the IoT domain for your test success!

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What describes global variables in programming languages?

Restricted to a function only
Used only in specific modules
Can be accessed anywhere in a program
Confined to the main method

The correct answer is: Can be accessed anywhere in a program

Global variables are defined at a global scope, which means they can be accessed from anywhere in a program, regardless of which function or module the code is executing in. This characteristic allows different parts of the program to share data easily and facilitates communication among various functions or classes without needing to pass variables as parameters. The accessibility of global variables provides convenience but also requires careful management, as their modification can lead to unintended side effects in different parts of the program. This is what distinguishes them from local variables, which are confined to the scope of a function or code block. Understanding the use of global variables is essential for effective programming, especially in large applications where maintaining state and data consistency is crucial.