Compilare: user.cpp: In function ‘int main()’: user.cpp:18:36: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 3 has type ‘long double*’ [-Wformat=] fscanf(fi,"%lf %lf " ,&x,&y); ^ user.cpp:18:36: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 4 has type ‘long double*’ [-Wformat=] user.cpp:24:53: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 3 has type ‘long double*’ [-Wformat=] fscanf(fi,"%lf %lf %lf %lf" ,&x1,&y1,&x2,&y2); ^ user.cpp:24:53: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 4 has type ‘long double*’ [-Wformat=] user.cpp:24:53: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 5 has type ‘long double*’ [-Wformat=] user.cpp:24:53: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 6 has type ‘long double*’ [-Wformat=] user.cpp:16:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:18:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf %lf " ,&x,&y); ^ user.cpp:24:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf %lf %lf %lf" ,&x1,&y1,&x2,&y2); ^