Compilare: user.cpp: In function ‘void show()’: user.cpp:26:32: warning: format ‘%lf’ expects argument of type ‘double’, but argument 3 has type ‘int’ [-Wformat=] fprintf(out, "%.7lf", 0); ^ user.cpp: In function ‘void read()’: user.cpp:16:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf%lf", &starting_money, &wished_money); ^