Do global variables in C need to be initialized?

In C programming language, global variables can be initialized or left uninitialized. If no initial value is provided explicitly, they will be automatically initialized to their corresponding default values based on their data types.

You can assign a specific initial value to a global variable when defining it. For example:

int globalVar = 10;

The above code initializes the global variable `globalVar` to 10. If not explicitly assigned, it will be automatically initialized based on its type. For integer types, uninitialized global variables will be initialized to 0; for floating-point types, they will be initialized to 0.0; and for pointer types, they will be initialized to a NULL pointer.

Global variables can be operated with their initial values, whether initialized manually or relying on default initialization. However, it is important to note that the initialization of global variables only occurs once when the program starts, and they have a scope that spans the entire program.