Compilare: main.cpp: In member function 'char InParser::read_ch()': main.cpp:25:29: 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); ^ main.cpp: In function 'int main()': main.cpp:184:46: warning: 'location.Rectangle::x1' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << answer << "\n" << location.x1 << " " << location.y1 << " " << location.x2 << " " << location.y2; ^~~ main.cpp:184:108: warning: 'location.Rectangle::y2' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << answer << "\n" << location.x1 << " " << location.y1 << " " << location.x2 << " " << location.y2; ^ main.cpp:184:90: warning: 'location.Rectangle::x2' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << answer << "\n" << location.x1 << " " << location.y1 << " " << location.x2 << " " << location.y2; ^~~ main.cpp:184:68: warning: 'location.Rectangle::y1' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << answer << "\n" << location.x1 << " " << location.y1 << " " << location.x2 << " " << location.y2; ^~~