Borderou de evaluare (job #430153)

Compilare: user.cpp: In function ‘void update(int)’: user.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘char next_char()’: user.cpp:30:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:59:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:63:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:50:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:51:34: 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_char()’: user.cpp:31:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]