In C, there appear to be differences between various values of zero -- NULL, NUL and 0. I know that the ASCII character '0' evaluates to 48 or 0x30. The NULL pointer is usually defined as: …

2011年3月4日 · Conceptually, zero (0) is a number, and NULL is a value that represents "no value". As such, 0 can be added, subtracted, etc., but NULL cannot. The NULL value for a …

As for null >= 0, as ToPrimitive(null, hint: Number) results null. Null The result equals the input argument (no conversion). For the "The Abstract Relational Comparison Algorithm" of …

194) Possible definitions include 0 and 0L, but not (void*)0 To hammer some points home: The NULL macro, nullptr literal (C++ only), and null pointer constant are always 0-valued; The null …

2008年10月7日 · NULL, 0, 0.0, '\0', 0x00 and whatelse all translate to the same thing, but are different logical entities in your program. They should be used as such. NULL is a pointer, 0 is …

2013年10月29日 · 0 is a number, you use it to check if a numeric value (int, short, float, double, etc.) is the number 0. null is the value of a reference that points nowhere, you use it to make …

2008年9月26日 · False, Null, Nothing, 0, Undefined, etc., etc. Each of these has specific meanings that correlate with actual concepts. Sometimes multiple meanings are overloaded …

2015年2月25日 · Using the constant 0 (or any constant expression evaluating to 0) anyplace where NULL would be used is safe, as 0 is a null pointer constant. This is defined in section …

Since foreign keys don't normally start with 0 but instead start with 1, it means you wouldn't expect the 0 to be used as a value. You can then use the 0 to denote the 'No' value state. Using it in …

2011年2月24日 · typeof null returning "object" makes sense. The only other value that would make sense would be "null", since it definitely should return something different from typeof …