转:http://www.linuxforu.com/2012/01/joy-of-programming-understanding-bit-fields-c/ By S.G. Ganesh on January 30, 2012 in Coding, Columns· 2 Comments One important feature that distinguishes C as a systems programming language is its support for bit-fields. Let us explore this feature...
Bit Field Storage in C Consider the following structure to start a discussion on bit field storage: struct{unsignedcharis_married;unsignedcharis_graduated;}status0; This structure requires two bytes of memory space; however, we have to store either 0 or 1 in both fields. Let’s move ahead to...
You can use bit fields to represent binary numbers or to pack multiple variables into a single variable. Bit fields are often used in hardware programming and embedded systems where memory is limited. #include <iostream> struct BitField {unsigned int a : 3; // 占用...
C Bit Fields - Learn about C Bit Fields, their significance, and how to use them effectively in your C programming projects.
Bit fields are used to consume memory efficiently in such a way that we manage our memory space in a smooth manner. It can be used in structure and union too. How To Implement a Bit Field in the C Program 1 2 3 4 5 6 7
The order of bit-fields within an allocation unit (on some platforms, bit-fields are packed left-to-right, on others right-to-left) In the C++ programming language, the width of a bit-field can exceed the width of the underlying type (but the extra bits are padding bits), and bit-fi...
In C and C++, bit fields are one of the more odd declaration types that you run into rarely. The basic idea behind them is to provide the programmer with a way to define declarations at the bit-level. For instance, let’s say you have 8 boolean flags you want the programmer to be ...
A set of programming macros implement bit-fields in a variable, such as an unsigned integer structure having a bit-field definition number associated with each bit-field. The bit-field definition numbers have a value that defines the associated bit-field in terms of its end bits. In various ...
Network packets place someprotocoldata inbit fieldsthat are smaller than typical processor operand sizes. C languagestructurescan represent such protocols but the uncertain layout and endian-specific nature of C’s bit fields cause problems. Research has ranged from alternative bit field constructs, thr...
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