Eroare de compilare: user.cpp:4: error: ‘tr1’ is not a namespace-name user.cpp:4: error: expected namespace-name before ‘;’ token user.cpp:8: error: expected constructor, destructor, or type conversion before ‘<’ token user.cpp: In function ‘int main()’: user.cpp:18: error: ‘s’ was not declared in this scope user.cpp:20: error: ‘s’ was not declared in this scope user.cpp:21: error: ‘s’ was not declared in this scope user.cpp:26: error: ‘s2’ was not declared in this scope user.cpp:28: error: ‘s’ was not declared in this scope