Compilare: main.cpp: In function 'std::pair<int, int> numar(std::string, int)': main.cpp:9:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | while(i<ec.size()&&ec[i]>='0'&&ec[i]<='9') | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:35:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i=0;i<ec.length();i++) | ~^~~~~~~~~~~~ main.cpp:57:84: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 57 | while(!operatii.empty()&&operatii.top()!='('&&((ec[i]=='+'||ec[i]=='-')&&((operatii.top()=='/'||operatii.top()=='*'))||((ec[i]=='*'||ec[i]=='/')&&(operatii.top()=='/'||operatii.top()=='*')))) | ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~