Compilare: main.cpp: In function 'void skipSpaces()': main.cpp:12:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | while (pos < s.size() && isspace(s[pos])) { | ~~~~^~~~~~~~~~ main.cpp: In function 'int parseFactor()': main.cpp:38:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while (pos < s.size() && isdigit(s[pos])) { | ~~~~^~~~~~~~~~ main.cpp: In function 'int parseTerm()': main.cpp:50:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | while (pos < s.size() && (s[pos] == '*' || s[pos] == '/')) { | ~~~~^~~~~~~~~~ main.cpp: In function 'int parseExpression()': main.cpp:66:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | while (pos < s.size() && (s[pos] == '+' || s[pos] == '-')) { | ~~~~^~~~~~~~~~