CMU CS Academy Unit 2 Part 6 Global Variables and Scope

What is the primary reason for using variables in programming?

• To store data temporarily

• To increase program execution time

• To make the code look complex

• To reduce the memory usage

What is the scope of a variable?

• The number of functions that can use the variable

• The range within the program where the variable can be accessed

• The memory size of the variable

• The duration the variable exists in memory

What happens if you try to use a locally scoped variable outside its function?

• The variable's value is reset

• The program crashes

• The variable is automatically converted to global scope

• The variable cannot be accessed

What defines a local scope for a variable?

• The variable can be accessed anywhere in the program

• The variable is only accessible within the function it was declared in

• The variable is accessible before its declaration

• The variable can be accessed only after it is declared

What does it mean when a variable is said to have a local scope?

• It is only usable within the block it was defined

• It can be declared multiple times in different functions

• It can be used globally

• It doesn't consume any memory

Where should a global variable be declared to be accessible throughout the program?

• Inside a loop

• At the end of the program

• Inside any function

• At the beginning of the program

Why are global variables generally discouraged?

• They are not supported in modern programming languages

• They use too much memory

• They can lead to code that is hard to debug

• They slow down the program execution

How can you make a variable accessible in any part of your program?

• Declare it inside a loop

• Declare it as a global variable

• Declare it inside a function

• Declare it as a constant

What is a potential problem with using global variables?

• They cannot store integer values

• They are deleted after the program executes

• They can lead to unexpected errors due to scope overlap

• They automatically convert to local variables

Why is it important to declare variables in the correct scope?

• To make the code easier to understand and debug

• To use less storage on the disk

• To prevent memory leaks

• To ensure the program runs faster