Borderou de evaluare (job #29971)

Compilare: user.cpp: In function ‘int main()’: user.cpp:25:34: warning: unused variable ‘u’ [-Wunused-variable] user.cpp:26:10: warning: unused variable ‘flag’ [-Wunused-variable] user.cpp:29:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:30:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp: In function ‘void read()’: user.cpp:13:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:15:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp: In function ‘int main()’: user.cpp:43:31: warning: ‘x’ may be used uninitialized in this function [-Wuninitialized]