Compilare: main.cpp: In function 'void p2()': main.cpp:49:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (poz < a.size()) ~~~~^~~~~~~~~~ main.cpp:55:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz >= a.size()) ~~~~^~~~~~~~~~~ main.cpp: In function 'std::__cxx11::string evaluate_paranteze_patrate()': main.cpp:89:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (poz < a.size() && a[poz] != ']' && a[poz] != '*') ~~~~^~~~~~~~~~ main.cpp:95:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!(poz < a.size() && a[poz] != ']' && a[poz] != '*')) ~~~~^~~~~~~~~~ main.cpp: In function 'std::__cxx11::string evaluate_paranteze_rotunde(int)': main.cpp:143:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (poz < a.size() && a[poz] != ')') ~~~~^~~~~~~~~~ main.cpp:149:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!(poz < a.size() && a[poz] != ')')) ~~~~^~~~~~~~~~ main.cpp: In function 'int make_number()': main.cpp:178:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (numar(a[poz]) == true && poz < a.size()) ~~~~^~~~~~~~~~ main.cpp: In function 'std::__cxx11::string make_leter_str()': main.cpp:189:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (litera(a[poz]) == true && poz < a.size()) ~~~~^~~~~~~~~~