Borderou de evaluare (job #403325)

Compilare: user.cpp: In function 'int main()': user.cpp:10:9: warning: unused variable 'n' [-Wunused-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:12:5: warning: 'c' is used uninitialized in this function [-Wuninitialized]