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The first declaration allocates memory for a pointer; the second allocates memory for 20 characters.....
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A null pointer does not point to any object. NULL and 0 are interchangeable in pointer contexts.Usage of NULL should be considered a gentle reminder that a pointer....
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A pointer to a function is a pointer that points to a function. A function pointer is a pointer that either has an indeterminate value, or has a null pointer value, or points to a function
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