https://purengom.com/2008/01/30/%ec%9d%b4-%ec%84%b8%ec%83%81%ec%97%90-%eb%82%98-%ed%95%98%eb%82%98-%eb%bf%90%ec%9d%b8-%ed%95%98%ec%9d%b4%ed%85%8c%ed%81%ac-c-%eb%a9%80%ed%8b%b0%ed%8e%9c%ec%9d%84-%eb%a7%8c%eb%93%a4%ec%9e%90-hi-tec-c-c/