C++ pure virtual method implementation by other class -


बाहरी पुस्तकालय से आता है ए वर्ग को देखने देता है 

  वर्ग ए {सार्वजनिक: शून्य विधि () {cout & lt; & lt; "नमस्ते"; }};   
 और मेरा वर्चुअल क्लास  बी  शुद्ध वर्चुअल  विधि ()   
  वर्ग बी {सार्वजनिक : वर्चुअल शून्य विधि () = 0; };   
 मैंने  A  और  बी   
 
 < कोड> कक्षा डी: सार्वजनिक ए, सार्वजनिक बी {};   
 लेकिन जब मैं  डी  का एक उदाहरण बना देता हूं, तो मुझे निम्न त्रुटि मिलती है:  
  त्रुटि: चर को घोषित नहीं कर सकता ?? ?? दा ???? यह सार सार तत्व नहीं था और यह  विधि को कॉल कर सकता था।    ()  वर्ग से  ए ?  
 नमूना कोड:   
 
 
 आपको  विधि  में  डी  ओवरराइड करना होगा। आप इसे ऐसा कर सकते हैं  
  वर्ग डी: सार्वजनिक ए, सार्वजनिक बी {सार्वजनिक: शून्य विधि () ओवरराइड {ए :: विधि (); }};

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