Compilare: main.c: In function 'main': main.c:22:22: warning: format '%lf' expects argument of type 'double *', but argument 3 has type 'long double *' [-Wformat=] fscanf(in,"%lf %lf", &x[i], &y[i]); ^ main.c:22:26: warning: format '%lf' expects argument of type 'double *', but argument 4 has type 'long double *' [-Wformat=] fscanf(in,"%lf %lf", &x[i], &y[i]); ^ main.c:18:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d", &N); ^~~~~~~~~~~~~~~~~~~ main.c:22:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%lf %lf", &x[i], &y[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~