Discussion
NULL is the macro defined in the header string. h.
Answer: A
Correct answer: true
NULL, the null pointer constant, is defined in several headers, and <string.h> is one of them - along with <stdio.h>, <stdlib.h>, <stddef.h> and others. Repeating the definition is harmless because it is identical each time, so a program gets NULL from whichever header it happens to include.
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