output.txt

main.c:5:16: error: parameter 1 (‘vargp’) has incomplete type
 void func(void vargp)
                ^~~~~
main.c: In function ‘func’:
main.c:9:34: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘double’ [-Wformat=]
             printf("sqrt(16) IS %d", sqrt(16));
                                 ~^
                                 %f
main.c:10:24: warning: ‘return’ with a value, in function returning void
                 return NULL;
                        ^~~~
main.c:5:6: note: declared here
 void func(void vargp)
      ^~~~
main.c: In function ‘main’:
main.c:15:17: error: unknown type name ‘pthread_t’
                 pthread_t t;
                 ^~~~~~~~~
main.c:17:17: warning: implicit declaration of function ‘pthread_create’ [-Wimplicit-function-declaration]
                 pthread_create(&t, NULL, func, NULL);
                 ^~~~~~~~~~~~~~
main.c:18:17: warning: implicit declaration of function ‘pthread_join’ [-Wimplicit-function-declaration]
                 pthread_join(t, NULL);
                 ^~~~~~~~~~~~
main.c:20:17: warning: implicit declaration of function ‘pthread_exit’ [-Wimplicit-function-declaration]
                 pthread_exit(NULL);
                 ^~~~~~~~~~~~
main.c:22:9: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration]
         exit(0);
         ^~~~
main.c:22:9: warning: incompatible implicit declaration of built-in function ‘exit’
main.c:22:9: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’