Compilare: user.c: In function ‘main’: user.c:33:2: warning: implicit declaration of function ‘strtok_r’ [-Wimplicit-function-declaration] p2 = (char *)strtok_r (copyp, ",", tok3); ^ user.c:9:9: warning: unused variable ‘ok’ [-Wunused-variable] int i, ok; ^ user.c:8:36: warning: unused variable ‘tok2’ [-Wunused-variable] char *p, *p1, *p2, *p3, **tok1, **tok2, **tok3, *copyp; ^ user.c:8:28: warning: unused variable ‘tok1’ [-Wunused-variable] char *p, *p1, *p2, *p3, **tok1, **tok2, **tok3, *copyp; ^