Compilare: main.cpp: In function 'int rest_mod_3()': main.cpp:62:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for (i = 0; i < suma.length(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void rest0()': main.cpp:78:10: warning: statement has no effect [-Wunused-value] 78 | for (i; i < suma.length(); i++) | ^ main.cpp:78:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for (i; i < suma.length(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void rest1()': main.cpp:91:33: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 91 | string temp = suma.length() >= nr_cifa ? suma.substr(suma.length()-nr_cifa, nr_cifa) : suma; | ~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:94:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 94 | if (suma.length() <= nr_cifa) | ~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:104:30: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 104 | while (temp.length() > nr_cifa) | ~~~~~~~~~~~~~~^~~~~~~~~ main.cpp:90:9: warning: unused variable 'cif' [-Wunused-variable] 90 | int cif, rest = 0, sum; | ^~~ main.cpp: In function 'void rest2()': main.cpp:139:33: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 139 | string temp = suma.length() >= nr_cifb ? suma.substr(suma.length()-nr_cifb, nr_cifb) : suma; | ~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:142:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 142 | if (suma.length() <= nr_cifb) | ~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:152:30: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 152 | while (temp.length() > nr_cifb) | ~~~~~~~~~~~~~~^~~~~~~~~ main.cpp:138:9: warning: unused variable 'cif' [-Wunused-variable] 138 | int cif, rest = 0, sum; | ^~~