Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6: error: request for member ‘stdin’ in ‘"r"’, which is of non-class type ‘const char [2]’ user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result