C Programming - Structures, Unions, Enums - Discussion

Bit field used for save memory for that member who occupied 1 or 2 bit rather then int.

The questions is CAN USE?,

The answer is YES, and can be very useful if used with a struct.
To be more specific, a struct of bitfields inside a union is a nice way to have two or more interpretations of the same data. It is very useful in low-level programming with hardware.

union Point{
struct {
unsigned int x:4;
unsigned int y:4;
};
int res;
};

int main(){
union Point pt;
pt.x = 2;
pt.y = 3;
printf("\n The value of res = %d %d %d" , pt.res, pt.x, pt.y );

pt.res = pt.y;
printf("\n The value of res = %d %d %d" , pt.res, pt.x, pt.y );
return 0;
}

What is bit field?

What is meant by bitfields?

In union, which datatype has highest size is equal to that union size.

ex. union demo
{
int i;
char c;
};
sizeof(demo);// 4(bcoz size of int is greater than size of char)

the addition of all data elements or data members is equal to the size of the structure.

ex.
struct demo
{
int i;
char c;
};

sizeof(demo);// 5(addition of int and char).

Give any two difference between union and structure.

What is a bit field?

Assigning of values to a memory location is bit field?

Please explain bit field?

struct
{
type [member_name] : width ;
};

Below the description of variable elements of a bit field:

Type An integer type that determines how the bit-field's value is interpreted. The type may be int, signed int, unsigned int.

Member_name The name of the bit-field.

Width The number of bits in the bit-field. The width must be less than or equal to the bit width of the specified type.

The variables defined with a predefined width are called bit fields.