Eroare de compilare: user.cpp: In function 'void calcul(long int)': user.cpp:3: error: 'i' was not declared in this scope user.cpp:4: error: 'a' was not declared in this scope user.cpp:5: error: 'x' was not declared in this scope user.cpp:9: error: 'a' was not declared in this scope user.cpp:15: error: 'a' was not declared in this scope user.cpp: In function 'int main()': user.cpp:25: error: 'n' was not declared in this scope user.cpp:25: error: 'k' was not declared in this scope user.cpp:26: error: 'i' was not declared in this scope user.cpp:27: error: 'x' was not declared in this scope user.cpp:29: error: 'x' was not declared in this scope