Borderou de evaluare (job #42943)

Compilare: user.cpp: In function ‘int main()’: user.cpp:10:21: warning: variable ‘u’ set but not used [-Wunused-but-set-variable] user.cpp:10:23: warning: unused variable ‘x’ [-Wunused-variable] user.cpp:8:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:9:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]