StackOverflow2013

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plurals

PO
primarykey
Id
19555549
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-10-24T01:57:27.240
FavoriteCount
0
LastActivityDate
2013-10-24T02:06:29.413
LastEditDate
2013-10-24T02:06:29.413
LastEditorUserId
1670129
OwnerUserId
1670129
ParentId
19555481
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
The exact definition of <code>NULL</code> is implementation-defined; all that's guaranteed about it is that it's a macro that expands to a null pointer constant. In turn, a null pointer constant is "an integral constant expression (5.19) prvalue of integer type that evaluates to zero or a prvalue of type <code>std::nullptr_t</code>." It may or may not be convertible to <code>char</code> or <code>unsigned char</code>; it should only really be used with pointers. <code>0</code> is a literal of type <code>int</code> having a value of zero. <code>'\0'</code> is a literal of type char having a value of zero. Either is implicitly convertible to <code>unsigned char</code>, producing a value of zero. It is purely a convention that a string in C and C++ is often represented as a sequence of <code>char</code>s that ends at the first zero value. Nothing prevents you from declaring a char array that doesn't follow this convention: <pre><code>char embedded_zero[] = {'a', '\0', 'b'}; </code></pre> Of course, a function that expects its argument to follow the convention would stop at the first zero: <code>strlen(embedded_zero) == 1;</code>. You can, of course, write a function that takes <code>unsigned char*</code> and follows a similar convention, requiring the caller to indicate the end of the sequence with an element having zero value. Or, you may write a function that takes a second parameter indicating the length of the sequence. You decide which approach better fits your design.
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1. This table or related slice is empty.
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1. POIs NULL (or 0 or '\0') value interpreted differently in unsigned char array and char array in c++?
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1. PTAnswer
UserLastEditorUserId
1. USIgor Tandetnik
UserOwnerUserId
1. USIgor Tandetnik
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1. POIs NULL (or 0 or '\0') value interpreted differently in unsigned char array and char array in c++?
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