Compilare: user.cpp: In function ‘void transformare(std::string, int&)’: user.cpp:17:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<s.length();i++) ^ user.cpp: In function ‘int main()’: user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<initial.length();i++){ ^ user.cpp:79:104: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (initial[j] == ' ' or initial[j] == '(' or initial[j] == ')' or j == initial.length()) ^