Compilare: main.cpp: In member function 'void Number::decompose(long long int)': main.cpp:92:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fact.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In member function 'long long int Number::full()': main.cpp:105:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fact.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In member function 'void Number::multiply(long long int)': main.cpp:115:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fact.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In member function 'void Number::divide(long long int)': main.cpp:129:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fact.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: At global scope: main.cpp:142:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^