Compilare: main.cpp: In function 'int rest_mod_3()': main.cpp:59:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for (i = 0; i < suma.length(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void rest0()': main.cpp:75:10: warning: statement has no effect [-Wunused-value] 75 | for (i; i < suma.length(); i++) | ^ main.cpp:75:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (i; i < suma.length(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void adunare(int)': main.cpp:95:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | while (++i < suma.length() && (rest>0 || x>0)) | ~~~~^~~~~~~~~~~~~~~