Compilare: user.c: In function ‘executa’: user.c:8:11: warning: unused variable ‘bb’ [-Wunused-variable] int aa, bb; ^ user.c:8:7: warning: unused variable ‘aa’ [-Wunused-variable] int aa, bb; ^ user.c:9:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d%d", &a, &b, &x, &y); ^ user.c: In function ‘main’: user.c:40:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^