Compilare: user.cpp: In function ‘void update(int, int, int)’: user.cpp:111:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = x; i < MAX_VAL; i += zero(i)) ^ user.cpp:112:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = y; j < MAX_VAL; j += zero(j)) ^ user.cpp: In function ‘char getChar()’: user.cpp:26:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, DIM, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:148:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoo.in", "r", stdin); ^ user.cpp:149:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoo.out", "w", stdout); ^ user.cpp:151:30: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, DIM, stdin); ^