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What is NULL Pointer in C Language Hindi Video Lecture | C Programming for Beginners: From Zero to Hero (in Hindi) - Back-End Programming
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| 1. NULL पॉइंटर क्या होता है? |  |
| 2. NULL पॉइंटर का उपयोग क्यों नहीं किया जा सकता है? | |
Ans. NULL पॉइंटर का उपयोग इसलिए नहीं किया जा सकता है क्योंकि इसमें कोई मौजूदा डेटा संरचना या मेमोरी संदर्भ नहीं होता है। इसलिए, NULL पॉइंटर को डेटा या मेमोरी में कोई वैध संदर्भ करने की क्षमता नहीं होती है।
| 3. NULL पॉइंटर को कैसे इनिशियलाइज़ किया जाता है? | |
Ans. NULL पॉइंटर को इनिशियलाइज़ करने के लिए, इसे सीधे 0 या (void *)0 से इनिशियलाइज़ किया जाता है। यहां, '0' एक शानदार तरीका है जो एक NULL पॉइंटर को इनिशियलाइज़ करने के लिए उपयोग किया जा सकता है।
| 4. क्या होता है जब हम NULL पॉइंटर को डीरेफ़ेरेंस करते हैं? | |
Ans. जब हम NULL पॉइंटर को डीरेफ़ेरेंस करते हैं, तो यह एक अवैध संदर्भ होता है। इसका कारण यह है कि NULL पॉइंटर किसी मौजूदा डेटा संरचना या मेमोरी संदर्भ के रूप में इस्तेमाल नहीं किया जा सकता है। इसलिए, जब हम NULL पॉइंटर को डीरेफ़ेरेंस करते हैं, तो यह एक undefined व्यवहार प्रदर्शित कर सकता है, जिससे एक अनुरूप परिणाम हो सकता है जैसे कि क्रैश या अनुरूप मान प्राप्ति।
| 5. क्या होता है जब हम NULL पॉइंटर की वैधता जांचते हैं? | |
Ans. NULL पॉइंटर की वैधता जांचने के लिए हम इसे अन्य एक वैध पॉइंटर के साथ तुलना कर सकते हैं। यदि दोनों पॉइंटर्स NULL हैं, तो वे एक दूसरे के समान होंगे। इसके अलावा, हम यह भी जांच सकते हैं कि क्या पॉइंटर NULL है या नहीं इस्तेमाल करके एक शर्ती सत्यापन (conditional validation) का उपयोग कर सकते हैं, जैसे कि if (pointer == NULL)।
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