Compilare: user.cpp: In function ‘std::string processText(std::string, char)’: user.cpp:13:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < text.length(); ++i) { ^ user.cpp:23:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < auxiliar.length(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:47:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < initialText.length(); ++i) { ^ user.cpp:55:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < initialText.length(); ++i) { ^