Compilare: user.cpp: In function ‘int main()’: user.cpp:42:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( out.size() != p ) ~~~~~~~~~~~^~~~ user.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (out.size() == p) last_cab = poz; ~~~~~~~~~~~^~~~ user.cpp:83:17: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result] system("pause"); ^