Compilare: user.cpp: In function ‘int main()’: user.cpp:116:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "euclid.in", "r", stdin ); ^ user.cpp:117:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "euclid.out", "w", stdout ); ^ user.cpp: In function ‘char nextChar()’: user.cpp:22:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread ( buff, 1, BUFFSIZE, stdin ); ^