Borderou de evaluare (job #340039)

Compilare: user.cpp: In function ‘int main()’: user.cpp:53:19: warning: NULL used in arithmetic [-Wpointer-arith] user.cpp:12:10: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] user.cpp:8:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:27:34: warning: ‘poz_dr’ may be used uninitialized in this function [-Wuninitialized] user.cpp:27:35: warning: ‘poz_st’ may be used uninitialized in this function [-Wuninitialized]