For convenience, 8 bits are usually grouped into a single block, conventionally called a byte. The next-largest named block of bits is a word. The definition and size of a word are not absolute, but vary from computer to computer. A word is the size of the most convenient block of data for the computer to deal with.
So is a word 2 bytes 16 bits , or is it the most convenient block of data for the computer to deal with? I am also not sure what this means.. I'm not familiar with either of these books, but the second is closer to current reality.
The first may be discussing a specific processor. The and processors used 16 bit words, and it's likely this is the machine the first author was writing about. In the 50's and 60's there were machines with words sizes that seem quite strange to us now, such as 4, 9 and Since about the 70's word size has commonly been a power of 2 and a multiple of 8. The second quote is correct, the size of a word varies from computer to computer. The ARM NEON architecture is an example of an architecture with bit words, where bit quantities are referred to as "doublewords" and bit quantities are referred to as "quadwords":.
A NEON operand can be a vector or a scalar. A NEON vector can be a bit doubleword vector or a bit quadword vector. A "bit" is a binary digit, either a 1 or 0.
A series of binary numbers is called a "word". In addition to the other answers, a further example of the variability of word size from one system to the next is in the paper Smashing The Stack For Fun And Profit by Aleph One:. We must remember that memory can only be addressed in multiples of the word size.
A word in our case is 4 bytes, or 32 bits. So our 5 byte buffer is really going to take 8 bytes 2 words of memory, and our 10 byte buffer is going to take 12 bytes 3 words of memory.
This is how the OS translates your keyboard key strokes into letters on the screen. When you press the ' A ' key, the keyboard sends a binary signal equal to the number 97 to the computer, and the computer prints a lowercase ' a ' on the screen.
If you replace '97' with any number from 0 to , you will see the character associated with that number on the system's character code page printed on the screen. If a character is 8 bits, or 1 byte, then a WORD must be at least 2 characters, so 16 bits or 2 bytes.
Traditionally, you might think of a word as a varying number of characters, but in a computer, everything that is calculable is based on static rules. Besides, a computer doesn't know what letters and symbols are, it only knows how to count numbers. Note that these terms are limited in function to the Windows API for developers, but may appear in other circumstances eg.
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