Compilare: user.cpp: In function ‘int main()’: user.cpp:53:40: warning: operation on ‘t’ may be undefined [-Wsequence-point] while (((t = a / 3) << 1) + t == a) { // factori de 3 ^ user.cpp:56:40: warning: operation on ‘t’ may be undefined [-Wsequence-point] while (((t = a / 5) << 2) + t == a) { ^ user.cpp:59:53: warning: operation on ‘t’ may be undefined [-Wsequence-point] while ((((t = a / 7)) << 2) + (t << 1) + t == a) { ^ user.cpp:59:53: warning: operation on ‘t’ may be undefined [-Wsequence-point] user.cpp:62:52: warning: operation on ‘t’ may be undefined [-Wsequence-point] while (((t = a / 11) << 3) + (t << 1) + t == a) { ^ user.cpp:62:52: warning: operation on ‘t’ may be undefined [-Wsequence-point] user.cpp: In function ‘char get()’: user.cpp:19:33: 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, BUFF_SIZE, f); ^