Compilare: user.cpp: In function ‘int main()’: user.cpp:16:39: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 3 has type ‘long double*’ [-Wformat=] fscanf(fi,"%lf " ,&a[i][j]); ^ user.cpp:54:39: warning: format ‘%lf’ expects argument of type ‘double’, but argument 3 has type ‘long double’ [-Wformat=] fprintf(fout,"%.10lf " ,sol[i]); ^ user.cpp:13:31: 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:16:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf " ,&a[i][j]); ^