Compilare: user.cpp: In function ‘unsigned int get_number()’: user.cpp:11:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(++q; buffer[q] > 47; ++q) ^ user.cpp:13:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] number = number * 10 + buffer[q] - 48; ^ user.cpp: At global scope: user.cpp:42:45: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) unsigned int gcd(unsigned int a, unsigned int b) ^~~ user.cpp:21:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_number(unsigned int x) ^~~~~~~~~~ user.cpp:7:45: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) unsigned int get_number() ^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:54:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in", "r", stdin); ^ user.cpp:55:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.out", "w", stdout); ^ user.cpp:57:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, BUFFER_SIZE, stdin); ^