Compilare: main.cpp: In member function 'void Number::decompose(int)': main.cpp:94:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fact.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In member function 'int Number::full()': main.cpp:107:20: 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(int)': main.cpp:117:20: 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(int)': main.cpp:131:20: 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:146:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^