Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:30: error: ‘stdin’ was not declared in this scope user.cpp:30: error: ‘freopen’ was not declared in this scope user.cpp:31: error: ‘stdout’ was not declared in this scope user.cpp:33: error: ‘scanf’ was not declared in this scope user.cpp:39: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:56: error: ‘printf’ was not declared in this scope