/in/ex1.c: In function 'main':
/in/ex1.c:6:7: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
     p = &s;
       ^
/in/ex1.c:3:14: error: unused parameter 'argc' [-Werror=unused-parameter]
 int main(int argc, char *argv[ ]){
              ^~~~
/in/ex1.c:3:26: error: unused parameter 'argv' [-Werror=unused-parameter]
 int main(int argc, char *argv[ ]){
                          ^~~~
cc1: all warnings being treated as errors