I have a simple question about static variables. If I declared a static variable in a function:
void main() { int k = 0 while(k<=4) { fun(); k++; } } int fun() { static int i=5; i++; printf(Value %d\t", i); return 0; } As I know, the function will deallocate after returning. But where is the i value stored. Is a static variable like a global variable.
The function will not deallocate i inside fun() on return. The storage for i is in the same general area as global variables — but it is not a global variable. It is only accessible inside the function fun() where it is defined. It is separate from any global variable i or any other variable i that is static inside any other function (in any source file), or from a file scope static variable i in the source file where fun() is defined. It has a lifetime as long as the program.
As I know, the function will deallocate after returning — No. I think your assumption is wrong!
static variables won't be deallocated after returning from the function.
Where is it stored? — static variables are stored in "Data Section" or "Data Memory".
Life — The life of the static variable starts when the program is loaded into RAM, and ends when the program execution finishes!
Is static is like global variable.No!!!! it's same in terms of life time.different in terms of visibility.void main()which is non-standard and only valid on Microsoft Windows with a Microsoft C compiler, and you haveint fun()and don't use its return value. It would be more orthodox to haveint main(void)andvoid fun(void)— though you'd have to define or declarefun()beforemain()if you changed its signature (though C89 compilers such as MSVC don't mind about the implicitintrule for functions, but that's a 25-year old standard and the 15-year old C99 standard outlawed implicit declarations for functions).