Một số lập trình, tuy nhiên, để mô tả một cách rõ ràng giá trị đối số giao thức. Điều này có thể là quan trọng cho các ứng dụng nhất định trong đó một giao thức cụ thể là cần thiết, và thay thế không được phép. Điều này cho phép bạn lựa chọn giao thức cuối cùng được sử dụng hơn là dựa vào ngày hôm nay của "hạt nhân của tháng". | 2 3 4 5 The number ofbits inawordiscaUcd theword size. The word size of the memory in Eigureil isfour hits. A computer with such a memory would be said to h NQfour-bitwords. Each word in this memory holds a number representable in four binary digits . a number from 0 through 15. So for example a processor requesting the word located at the address 3 would be given the number 8. When designing a chess playing computer for example it might be a good idea to use 64-bit words one bit for each location on the chess board. Words in computer memory are numbered consecutively starting from zero. These numbers are called addresses. In Figure 2-1 the addresses are the integers from 0 through 5. A computer with n words will have addresses from 0 through n-1. When requesting data transfers into or out from memory computer processors use addresses to specify which data words are to be transferred. The total capacity of a computer memory is the number of words in the memory times the word size length times width. The little memory in Figure 2-1 has a capacity of 24 bits. Memory capacity is often measured in bytes instead ofbits. One byte of memory is the same as eight bits. Computersbased oulutcl processors use eight-bit words. Awarumg uoters in order here. Because documentation from Intel and Microsoft use the termworj to refer to a 16-bit object this usage has become fairly standard. This is unfortunate. It is better to leave the term with its machine-dependent meaning. In any case the number ofbytes in the memory of an Intel-based machine is the same as the number of addresses. Because the number of words in a computer memory is typically a large power of two or a small multiple thereof several names for these large powers of two have been adapted from the metric system. For example 210 is 1024 and 1024 is approximately 1000. In the metric system the letter K from kilo is used to stand for 1000. In reference to computer memory kilo means 1024. Other metric prefixes which .
