Borderou de evaluare (job #552350)

Compilare: user.cpp: In function ‘int main()’: user.cpp:113:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:55:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:56:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp: In function ‘char next_ch()’: user.cpp:17:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]