Compilare: main.cpp: In function 'void Citire()': main.cpp:33:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (p = 0; p < expr.length(); p++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int Eval(int, int)': main.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (k = 1; k < s.length(); ) | ~~^~~~~~~~~~~~