2014年12月22日 · 0L is a long integer value with all the bits set to zero - that's generally the definition of 0. The ~ means to invert all the bits, which leaves you with a long integer with all the bits set to one. In two's complement arithmetic (which is almost universal) a signed value with all bits set to one is -1.

2011年8月12日 · 0 // normal number is interpreted as int 0L // ending with 'L' makes it a long 0LL // ending with 'LL' makes it long long 0UL // unsigned long 0.0 // decimal point makes it a double 0.0f // 'f' makes it a float

2014年7月2日 · Long bar = 0L; // Second way of doing it This is a long literal, so it will only create a long . I imagine the difference is negligible, but it would be quicker to create a long than to create an int then cast to long .

2001年10月16日 · long l = 0L; // Assigns const long literal 0 to long variable l Remember that this is the C language (not Win32) so the size of an int and the a size of long are not necessarily the same. If the sizes are different, then the compiler must decide how to do the conversion. In this case, it's trivial since 0 is the same in both cases.

As others have pointed out, Long l = Long.valueOf(0) and Long l = 0L will compile to the same bytecode, the only difference is style and readability. Additionally.. It's a bit silly to worry about time complexity for something like this: both expressions are constant time.

2009年12月15日 · The null pointer representation is implementation specific, but neither 0 nor 0L is necessarily that implementation - they are just ways that the user can specify the null pointer, and either is OK. I should point out that Bjarne Stroustrup has several times indicated that his preference is to use plain 0 (and not NULL).

2015年2月9日 · x + 0L is an element wise operation on x; as such, it often preserves the shape of the data. as.integer isn’t: it takes the whole structure – here, a matrix – and converts it into a one-dimensional integer vector.

2011年5月1日 · The 0L means the number zero of type long. It uses this constructor to instantiate a Date that refers to zero milliseconds after (i.e. exactly) "the epoch", January 1, 1970, 00:00:00 GMT. Share

2011年6月22日 · About java.time. The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

However, looking on the internet I found that all 0L-languages are, in fact, context-free, although they were defined a bit differently. I am relatively sure that my proof is correct, so the given definition for 0L-languages (or 0L-systems) above must be wrong, but I simply wanted to ask to make sure I wasn't missing something obvious.