Compilare: main.cpp: In function 'int main()': main.cpp:22:25: warning: format '%lf' expects argument of type 'double', but argument 3 has type 'long double' [-Wformat=] fprintf(g,"%lf",aria); ^ main.cpp:13:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ main.cpp:15:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lf %lf", &a[i].x, &a[i].y); ^