Static and Automatic Variables

[carrot]

Hi,

Can anyone let me know the difference between Static and Automatic Variables with an example?

Thanks in Advance,
Carrot

 

[srizbf]

a static variale value will be available for all in the source.

automatic is dynamic in its scope.
i.e , some parts cannot access its value.

 

[srideepa]

Example .

Function 1 has variables A(Equals 20) and S (Equals 25)
A - Auto S - Static Variable.
Function 2 has variable A(Equals 30) defined in it.
Function 3 has no variables declared in it.
In case of Auto, the variable A will have value of 20 or 30 depending on where we are. If we are in Function1, it will have 20 and if we are in Function 2, it will have 30. In function 3, if we try to use variable A, we will get an error indicating "Undefined Variable" because within that function, we have not declared it.

In case of static, S will have the value 25 wherever it is called. No need to even define it..

Regards,
R.Srideepa