Compilare: main.cpp: In function 'void adun(std::string&, std::string&)': main.cpp:30:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for( i = 0; i < b.size(); i++ ) { | ~~^~~~~~~~~~ main.cpp:36:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while( i < a.size() && a[i] + 1 > 9 ) | ~~^~~~~~~~~~ main.cpp:39:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if( i < a.size() ) | ~~^~~~~~~~~~ main.cpp: In function 'std::string scad(std::string, std::string&)': main.cpp:49:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for( i = 0; i < b.size(); i++ ) { | ~~^~~~~~~~~~ main.cpp:60:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | while( i < a.size() && a[i] == 0 ) { | ~~^~~~~~~~~~