Compilare: main.cpp: In function 'int main()': main.cpp:46:22: 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(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:53:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | while(i < s.size() && isdigit(s[i])) { | ~~^~~~~~~~~~ main.cpp: In function 'int operator_priority(char)': main.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] 21 | } | ^ main.cpp: In function 'int calculeaza(int, int, char)': main.cpp:39:1: warning: control reaches end of non-void function [-Wreturn-type] 39 | } | ^