Compilare: user.c: In function ‘main’: user.c:8:3: warning: format ‘%Lf’ expects argument of type ‘long double *’, but argument 3 has type ‘double *’ [-Wformat=] fscanf(in, "%Lf%Lf", &xi, &yi); ^ user.c:8:3: warning: format ‘%Lf’ expects argument of type ‘long double *’, but argument 4 has type ‘double *’ [-Wformat=] user.c:11:5: warning: format ‘%Lf’ expects argument of type ‘long double *’, but argument 3 has type ‘double *’ [-Wformat=] fscanf(in, "%Lf%Lf", &x2, &y2); ^ user.c:11:5: warning: format ‘%Lf’ expects argument of type ‘long double *’, but argument 4 has type ‘double *’ [-Wformat=] user.c:19:3: warning: format ‘%Lf’ expects argument of type ‘long double’, but argument 3 has type ‘double’ [-Wformat=] fprintf(out, "%.5Lf", aria); ^ user.c:6:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:8:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%Lf%Lf", &xi, &yi); ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%Lf%Lf", &x2, &y2); ^