Global variables and local variables---C

Local variables:

Scope: Within a function (including parameter {except for special formal parameters}) or within a code block

Definition: Inside a function, including formal parameters, within a code block

Life cycle: Allocates memory from the defined line until the end of the last line within the code block it belongs to or the end of the return

Storage location: Local variables stored in the stack that are automatically freed when the scope ends

Note: Different scopes can define the same local variable, otherwise it is not possible. Uninitialized defaults are random values (garbage values)

Global variables:

Scope: outside a function or block of code

Life cycle: Starts from the defined line until the end of the last line of the owning program

Storage location: Static Storage Area

Note: If a function has local variables named the same as the global variable, then the nearest principle

Multiple variables with the same name point to the same storage space. Uninitialized defaults to 0

Global variables and local variables---C