Compilare: user.cpp: In function ‘int main()’: user.cpp:47:29: warning: format ‘%f’ expects argument of type ‘double’, but argument 3 has type ‘long double’ [-Wformat=] fprintf(so,"%.6f",maxx/2); ^ user.cpp:19:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%d%d",&n,&d); ^ user.cpp:21:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%hi %hi",&x[i].x,&x[i].y); ^ user.cpp:28:29: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] a+=arie(x[i],x[i+1]); ^