What is the difference between NULL and NUL?

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Arunava Chatterjee

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Basically NULL is predefined variable we can't defined value of NULL and NUL is defined by user its values changed by user time to time according its requirement.
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C, C++ Trainer

NUL is the notation for an ASCII character code 0 NULL is a macro defined in stddef for the null pointer.
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Difference between NULL and NUL in C. NULL is a macro defined in stddef.h for the null pointer. NUL is the name of the first character in the ASCII character set. It corresponds to a zero value.
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