Compilare: user.cpp: In function ‘void citire()’: user.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < s.length(); i++) ^ user.cpp: In function ‘void afis()’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.length();i++) ^ user.cpp: In function ‘void ver1()’: user.cpp:26:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < s.length() - 1 ; i++) ^ user.cpp: In function ‘int main()’: user.cpp:69:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.length(); i++) ^