I have mostly seen that the variable has a life time and scope.
But does any function also have life time and scope ?
Code:#include<stdio.h> void fun (void) { printf("sleep \n"); } int main(void) { fun(); return 0; }what the static function means in second code ?Code:#include<stdio.h> static void fun (void) { printf("sleep \n"); } int main(void) { fun(); return 0; }
> But does any function also have life time and scope ?
Their scope depends on whether you use the word 'static' or not.
Their lifetime is the life of the program - excluding the case of functions loaded via dynamic link libraries.
> what the static function means in second code ?
It limits who can call the function to only those functions also declared in the same source file.
Imagine you're creating a library containing several methods, which happen to make use of some utility functions.
You would make those utility functions static, so they can't be accessed by mistake by your library users.
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Thanks for making clear. A static function is accessible only within the file it is defined in. if we want to access from the another file then we have to make function externOriginally Posted by Salem
Or, declare a pointer to a function and initialize this pointer to the static function:
Code:/* module1.c */ static int f( int x ) { return x + x; } // visible to this module only; int (*fptr)(int) = f; // global extern ptr to function f;Code:/* module2.c */ extern int (*fptr)(int); ... int main( void ) { int a = fptr(2); // calling the module2.c static function, indirectly. ... }
Last edited by flp1969; 02-18-2020 at 12:18 PM.
Thanks @flp1969...Never thought that function pointer can be useful in that case too..
