Compilare: user.cpp: In function ‘int main()’: user.cpp:63:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < strlen(L) ;i++) ^ user.cpp:76:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!isalnum(L[i]) && i<strlen(L)) ^ user.cpp:92:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<S[linie].size();i++) ^