C bit field alignment

Bit-fields and unions may be combined in a way that permits programmers to pack and unpack bits in an integer. Unions allow programmers to circumvent C++’s strong typing rules while bit-fields allow programmers to access the bits that encode the compressed information .

Bit fields CANNOT be used in union .

Declaring Bit FIelds Variables that are defined using a predefined width or size are called bit fields. This bit field can leave more than a single bit. The format and syntax of bit-field declaration inside a structure is something like this: struct { data – type[nameofmember]: width_of_Bit – field; };

Bit fields CANNOT be used in union .

In C, we can specify size (in bits) of structure and union members . The idea is to use memory efficiently when we know that the value of a field or group of fields will never exceed a limit or is within a small range.10 Şub 2022