Compilare: main.cpp: In member function 'void bn::operator-=(bn)': main.cpp:79:13: warning: unused variable 'lnrc' [-Wunused-variable] int lnrc = 0, tr = 0; ^~~~ main.cpp:79:23: warning: unused variable 'tr' [-Wunused-variable] int lnrc = 0, tr = 0; ^~ main.cpp: In function 'int main()': main.cpp:103:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta.out","w",stdout); ^