I had always been taught 0–9 to lớn represent values zero khổng lồ nine, & A, B, C, D, E, F for 10-15.

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I see this format 0x00000000 and it doesn"t fit inlớn the pattern of hexadecimal. Is there a guide or a tutor somewhere that can explain it?

I googled for hexadecimal but I can"t find any explanation of it.

So my 2nd question is, is there a name for the 0x00000000 format?



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The 0x is just a prefix (used in C & many other programming languages) to lớn mean that the following number is in base 16.

Other notations that have been used for hex include:

$ABCDABCDhX"ABCD""ABCD"X

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Yes, it is hexadecimal.

Otherwise, you can"t represent A, for example. The compiler for C and Java will treat it as variable identifier. The added prefix 0x tells the compiler it"s hexadecimal number, so:

int ten_i = 10;int ten_h = 0xA;ten_i == ten_h; // this boolean expression is trueThe leading zeroes indicate the size: 0x0080 hints the number will be stored in two bytes; and 0x00000080 represents four bytes. Such notation is often used for flags: if a certain bit is mix, that feature is enabled.

P.S. As an off-topic note: if the number starts with 0, then it"s interpreted as octal number, for example 010 == 8. Here 0 is also a prefix.


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Everything after the x are hex digits (the 0x is just a prefix khổng lồ designate hex), representing 32 bits (if you were lớn put 0xFFFFFFFF in binary, it would be 1111 1111 1111 1111 1111 1111 1111 1111).


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hexadecimal digits are often prefaced with 0x to indicate they are hexadecimal digits. In this case, there are 8 digits, each representing 4 bits, so that is 32 bits or a word. I"m guessing you saw this in an error, & it is a memory address. this value means null, as the hex value is 0.


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