Bit field structures in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a bit field of 3 bits named 'flag'.

Embedded C

struct Status {
    unsigned int flag : [1];
};

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A3

B5

C8

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number larger than the type size.

Forgetting the colon ':' after the field name.

The bit field size is specified after the colon. Here, 'flag' is 3 bits wide.

2fill in blank

medium

Complete the code to declare a bit field named 'mode' with 2 bits inside the struct.

Embedded C

struct Control {
    unsigned int [1] : 2;
};

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Amode

Bstatus

Cflag

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong field name.

Omitting the bit size after the colon.

The field name is 'mode' and it has 2 bits allocated.

3fill in blank

hard

Fix the error in the bit field declaration to make it valid C code.

Embedded C

struct Flags {
    unsigned int error [1] 1;
};

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A,

B:

C;

D.

Attempts:

3 left

💡 Hint

Common Mistakes

Using a semicolon or comma instead of a colon.

Missing the colon entirely.

The colon ':' is required between the field name and the bit width in a bit field declaration.

4fill in blank

hard

Fill both blanks to declare a struct with two bit fields: 'ready' (1 bit) and 'error' (2 bits).

Embedded C

struct Status {
    unsigned int [1] : 1;
    unsigned int [2] : 2;
};

Drag options to blanks, or click blank then click option'

Aready

Bflag

Cerror

Dstate

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the field names.

Using incorrect bit sizes.

The first field is 'ready' with 1 bit, the second is 'error' with 2 bits.

5fill in blank

hard

Fill all three blanks to create a bit field struct with fields: 'mode' (3 bits), 'status' (4 bits), and 'flag' (1 bit).

Embedded C

struct Device {
    unsigned int [1] : 3;
    unsigned int [2] : 4;
    unsigned int [3] : 1;
};

Drag options to blanks, or click blank then click option'

Aflag

Bstatus

Dmode

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of fields.

Using the wrong field names for the bit sizes.

The fields are declared in order: 'mode' with 3 bits, 'status' with 4 bits, and 'flag' with 1 bit.