Compilare: user.c: In function ‘main’: user.c:21:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%u%*c%u%*c", &n, &kg); ^ user.c:25:4: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%u%*c%u%*c", &a, &b); ^ user.c: In function ‘get_empty’: user.c:62:1: warning: control reaches end of non-void function [-Wreturn-type] } ^