Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:18: error: ‘stdin’ was not declared in this scope user.cpp:18: error: ‘freopen’ was not declared in this scope user.cpp:19: error: ‘stdout’ was not declared in this scope user.cpp:21: error: ‘scanf’ was not declared in this scope user.cpp:36: warning: comparison between signed and unsigned integer expressions user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:71: error: ‘printf’ was not declared in this scope user.cpp:73: warning: comparison between signed and unsigned integer expressions