Learn and Master C Programming - Using 'extern' Keyword in our code

The video tutorial guides viewers through creating a new C project in Visual Studio, focusing on using the extern keyword to manage global variables across multiple files. It covers setting up the project, implementing functions, resolving compilation errors, and using forward declarations. The tutorial concludes with successfully compiling and running the project, demonstrating the output of global variable manipulation.

What is the first step in setting up a new project in Visual Studio?

• Install a new compiler

• Open the command prompt

• Create a new folder on the desktop

• Click on 'File' and select 'New Project'

Why does the compiler show an error when trying to use a global variable in another file?

• The variable is declared as static

• Each file is a separate compilation unit

• The variable is not initialized

• The variable is not used in the main function

What keyword is used to reference a global variable from another file?

• global

• extern

• public

• static

What is the purpose of a function prototype in C?

• To define the function

• To declare the function before its use

• To compile the function separately

• To execute the function

What is the output of the program after running it successfully?

• count equals 10, count equals 10

• count equals 20, count equals 10

• count equals 20, count equals 20

• count equals 10, count equals 20