Compilare: user.c: In function ‘main’: user.c:12:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(a+1, 2000010, fin); ^ user.c:14:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(b+1, 2000010, fin); ^