Compilare: user.c: In function ‘main’: user.c:14:20: warning: unused variable ‘cp2’ [-Wunused-variable] p1, p2, cp1, cp2; ^ user.c:14:15: warning: unused variable ‘cp1’ [-Wunused-variable] p1, p2, cp1, cp2; ^ user.c:18:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(a, MAXN, fin); ^ user.c:19:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(b, MAXN, fin); ^