Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:57: error: ‘stdin’ was not declared in this scope user.cpp:57: error: ‘freopen’ was not declared in this scope user.cpp:58: error: ‘stdout’ was not declared in this scope user.cpp:61: error: ‘scanf’ was not declared in this scope user.cpp:66: error: ‘printf’ was not declared in this scope user.cpp:73: warning: operation on ‘l’ may be undefined