Borderou de evaluare (job #184737)

Compilare: user.cpp: In function ‘int main()’: user.cpp:10:15: warning: unused variable ‘a’ [-Wunused-variable] user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:47:23: warning: ‘a’ may be used uninitialized in this function [-Wuninitialized]