Static variables

But before that let's do a recap

Local variables

Scope is a region of the program where a defined variable can exist and beyond which it cannot be accessed
Variables which are accessed inside a function or a block are called local variables.
They can only be accessed by the function they are declared in!
They are inaccessible to the functions outside the function they are declared in!

Global variables

These are the variables defined outside the main method.
Global variables are accessible throughout the entire program from any function.
If a local and global variable has the same name, the local variable will take preference.

Formal Arguments

These variables are treated as local variables with in a function.
These variables take precedence over global variables.

Now see Static variables in C

Static variables are variables which have a property of preversing their values even when they go out of scope.
They preserve their value from the previous scope and are not initialized again.
Static variable remains in memory throughout the span of the program
Static variables are initialized to 0 if not initialized explicitly.
- static int a; //just declared and not initialzed it with any value
- printf("%d",a); //the output will be 0.
In C, static variables can only be initialized using constant literals.
- we cannot do → static int b = func();
- This is because static variable allocates memory before running the main() function as the value of func() will not be generated that time.
- We can do → static char a = 'c'; static int b = 5;

Syntax

static data_type name = value;

static int harry = 7;
Even after using this variable it will still take some memory that's why global and static variables are not recommended.