21. Which data type is used to store a sequence of characters in C?
22. In C, which operator is used for pointer-to-pointer relationships?
23. What is the purpose of the 'sizeof' operator in C?
24. What does the 'NULL' keyword represent in C?
25. Which library function is used to allocate memory dynamically in C?
26. What is the purpose of the 'scanf' function in C?
27. Which operator is used to access the value stored at a pointer address in C?
28. What is the purpose of the 'goto' statement in C?
29. Which header file is used for mathematical functions in C?
30. What is the significance of the 'volatile' keyword in C?
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