Eroare de compilare: user.cpp: In function ‘void Read()’: user.cpp:29:21: error: ‘mul’ was not declared in this scope mul(B,16); ^ user.cpp:30:29: error: ‘add’ was not declared in this scope add(B,Str[i]-'0'); ^ user.cpp:35:21: error: ‘mul’ was not declared in this scope mul(B,16); ^ user.cpp:36:22: error: ‘add’ was not declared in this scope add(B,dig); ^ user.cpp: In function ‘int main()’: user.cpp:44:5: error: ‘cout’ was not declared in this scope cout << "Hello world!" << endl; ^