Compilare: user.cpp: In function ‘int NrLitere(std::string)’: user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.length(); i++) ^ user.cpp:40:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ver.length(); j++) ^ user.cpp: In function ‘int NrCuvinte(std::string)’: user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.length(); i++) ^ user.cpp:60:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ver.length(); j++) ^ user.cpp:67:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int m=0; m<ver2.length(); m++) ^ user.cpp:93:1: warning: control reaches end of non-void function [-Wreturn-type] } ^