Borderou de evaluare (job #37480)

Compilare: user.cpp: In function ‘int main()’: 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:30:23: warning: ‘b’ may be used uninitialized in this function [-Wuninitialized] user.cpp:28:18: warning: ‘a’ may be used uninitialized in this function [-Wuninitialized]