Compilare: main.cpp: In function 'int priority_operator(char)': main.cpp:23:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] 23 | if (c == '*' || c == '/') | ^~ main.cpp:25:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if' 25 | return -1; | ^~~~~~ main.cpp: In function 'int main()': main.cpp:53:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:86:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | while (i < s.size() && isdigit(s[i])) | ~~^~~~~~~~~~