C struct, typedef, enum & union - Tenouk C & C++

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STRUCT, TYPEDEF, ENUM & UNIONAlignment of Bit Fields• If a series of bit fields does not add up to the size of an int, paddingcan take place.• The amount of padding is determined by the alignmentcharacteristics of the members of the structure.• The following example demonstrates padding.• Suppose that an int occupies 4 bytes (4 x 8 = 32 bits). The exampledeclares the identifier onoffpower to be of type structswitching,struct switching {unsigned light : 1;unsigned fridge : 1;int count; /* 4 bytes */unsigned stove : 4;unsigned : 4;unsigned radio : 1;unsigned : 0;unsigned flag : 1;} onoffpower ;www.tenouk.com, © 18/93
STRUCT, TYPEDEF, ENUM & UNION• The structure switching contains eight members totaling 16 bytes.• The following table describes the storage that each memberoccupies,Member Name Storage Occupied Total Totallight 1 bit 1 bitfridge 1 bit 1 bit32 bits(padding up to 30 bits) To the next int boundary 30 bitscount The size of an int (4 bytes) 4 x 8 = 32 bits 32 bitsstove 4 bits 4 bits(unnamed field) 4 bits 4 bitsradio 1 bit 1 bit32 bits(padding up to 23 bits)To the next int boundary 23 bits(unnamed field)flag 1 bit 1 bit(padding up to 31 bits) To the next int boundary 31 bits32 bits16 bytes = 64 bits 4 x 32 bits = 128 bits 128 bitswww.tenouk.com, © 19/93
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C struct, typedef, enum & union - Tenouk C & C++

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