Compilare: user.cpp: In function ‘int main()’: user.cpp:83:32: warning: format ‘%Lf’ expects argument of type ‘long double’, but argument 3 has type ‘double’ [-Wformat=] fprintf(fout, "%.4Lf",dp[n]); ^ user.cpp:49:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:53:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&a[i].x,&a[i].y,&a[i].d); ^