Eroare de compilare: user.cpp:20: error: ‘add’ declared as function returning an array user.cpp:30: error: ‘cpy’ declared as function returning an array user.cpp: In function ‘int main()’: user.cpp:81: error: ‘cpy’ was not declared in this scope user.cpp:82: error: ‘add’ was not declared in this scope user.cpp:87: error: ‘sub’ was not declared in this scope user.cpp:89: error: ‘sub’ was not declared in this scope user.cpp:91: error: ‘cpy’ was not declared in this scope user.cpp:100: error: ‘add’ was not declared in this scope