Compilare: main.cpp: In function 'void genFormaPoloneza(std::__cxx11::string)': main.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (poz < s.length()) { ~~~~^~~~~~~~~~~~ main.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (poz + 1 < s.length() && isdigit(s[poz + 1])) ~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'int evalPol(std::__cxx11::string)': main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (++poz < s.length()) { ~~~~~~^~~~~~~~~~~~ main.cpp:54:20: warning: operation on 'nr' may be undefined [-Wsequence-point] nr = nr = nr * 10 + s[poz] - '0'; ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:55:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } while (poz < s.length() && isdigit(s[++poz])); ~~~~^~~~~~~~~~~~