Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<s.size()-1;i++) ^ user.cpp:26:17: error: ‘ok’ was not declared in this scope ok=1; ^ user.cpp:33:17: error: ‘ok’ was not declared in this scope ok=2; ^ user.cpp:37:20: error: ‘ok’ was not declared in this scope if(ok==2) ^ user.cpp:51:12: error: ‘ok’ was not declared in this scope if(ok==2) ^