Thread: accessing a static function

I am trying indirectly accessing a static function using function pointer within a program. , I've encountered errors that I'm struggling to resolve.

main.c

Code:

#include<stdio.h>

void (*fp)();


static void foo()
{
	printf("Welcome \n");
	
}


int main()
{
    fp = &foo;
	
	return 0;

}

file1.c

Code:

extern void (*fp)();

fp();

Output

Code:

file1.c:3:1: warning: data definition has no type or storage class fp();
 ^~
file1.c:3:1: warning: type defaults to 'int' in declaration of 'fp' [-Wimplicit-int]
file1.c:3:1: error: 'fp' redeclared as different kind of symbol
file1.c:1:15: note: previous declaration of 'fp' was here

 extern void (*fp)();