Question

What is the scope of a global variable?

Short answer

Answer: A global variable is a variable that is accessible throughout a program or script, usually defined outside all functions and main blocks of code. It can be accessed and modified in any part of the code, including within functions, classes, and other modules or files when properly imported. Its scope is the entire program or script.

Step-by-step solution

Understanding Global Variables

A global variable is a variable that is accessible throughout a program or script, usually defined outside all functions and main blocks of code. This means that global variables can be accessed and modified from any part of the code, including within functions.

Scope of a Global Variable

The scope of a global variable is the entire program or script. This means that a global variable can be accessed and modified in any part of the code, including within functions, classes, and other modules or files when properly imported.

Important Points

1. Global variables can be accessed from any part of the program, which makes them suitable for storing data that needs to be shared between different parts of the code. 2. Overusing global variables can lead to errors and make code harder to manage, as any part of the program can change the variable's value. 3. When modifying global variables within a function, it is necessary to use the "global" keyword to tell the interpreter that you're referring to the global variable instead of defining a new local variable with the same name. 4. In some programming languages, like Python, global variables must be properly imported when used in different modules or files.