C: Why a c function's parameter can't be declared as static ?

Question

#include<stdio.h>
void fun(static int a);
int main(void)
{
   static int z=0;

   fun(z);

   return 0;
}

void fun(static int a)
{
   printf("%d",a);
}

Answer 1

This generates compile time error because formal arguments of a function are of register (storage class) type by default. You cannot change it.

The problem is not just with static. You can cross verify by replacing the static with auto or extern or any storage class. It will still generate the same error.

Hope this helps.