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c++ - What does (~0L) mean? - Stack Overflow I'm doing some X11 ctypes coding, I don't know C but need some help understanding this In the C code below (might be C++ im not sure) we see (~0L) what does that mean? In Javascript and Python ~0
html - When to use lt;span gt; instead lt;p gt;? - Stack Overflow The <p> tag is a p aragraph, and as such, it is a block element (as is, for instance, h1 and div), whereas span is an inline element (as, for instance, b and a) Block elements by default create some whitespace above and below themselves, and nothing can be aligned next to them, unless you set a float attribute to them Inline elements deal with spans of text inside a paragraph They typically
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c - why is *pp [0] equal to **pp - Stack Overflow So pp [0] points to the address of p, which is 0x2000, and by dereferencing I would expect to get the contents of address 0x2000 That's were your reasoning strays, but understandably so In C, the right hand side of an assignment, or generally an evaluation of an lvalue (vulgo: variable), more precisely an lvalue-to-rvalue conversion, is already a dereferencing! For example, int i, j=0; i=j
What is a NullPointerException, and how do I fix it? When you dereference a pointer p, you say "give me the data at the location stored in "p" When p is a null pointer, the location stored in p is nowhere, you're saying "give me the data at the location 'nowhere'" Obviously, it can't do this, so it throws a null pointer exception In general, it's because something hasn't been initialized properly