Compilare: user.cpp: In function ‘int main()’: user.cpp:87:15: warning: unused variable ‘p’ [-Wunused-variable] int k, x, p = 1, el = 0; ^ user.cpp:87:22: warning: unused variable ‘el’ [-Wunused-variable] int k, x, p = 1, el = 0; ^ user.cpp:85:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitywar.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:18:38: 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, 4096, fin); ^