Compilare: user.c: In function ‘main’: user.c:32:2: warning: implicit declaration of function ‘strtok_r’ [-Wimplicit-function-declaration] p2 = strtok_r (copyp, ",", tok3); ^ user.c:32:5: warning: assignment makes pointer from integer without a cast [enabled by default] p2 = strtok_r (copyp, ",", tok3); ^ user.c:44:7: warning: assignment makes pointer from integer without a cast [enabled by default] p2 = strtok_r (NULL, ",", tok3); ^ In file included from /usr/include/string.h:637:0, from user.c:3: user.c:69:22: warning: comparison between pointer and integer [enabled by default] if (strchr (p, '}' != NULL)) fprintf (fout,"\n"); ^ user.c:69:22: warning: comparison between pointer and integer [enabled by default] if (strchr (p, '}' != NULL)) fprintf (fout,"\n"); ^ user.c:69:22: warning: comparison between pointer and integer [enabled by default] if (strchr (p, '}' != NULL)) fprintf (fout,"\n"); ^ user.c:69:22: warning: comparison between pointer and integer [enabled by default] if (strchr (p, '}' != NULL)) fprintf (fout,"\n"); ^ 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; ^