Why bitwise operations are essential in embedded in Embedded C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the 3rd bit of the variable 'flags'.

Embedded C

flags = flags [1] (1 << 2);

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

A&

B^

C|

D>>

Attempts:

3 left

💡 Hint

Common Mistakes

Using & will clear bits instead of setting them.

Using >> is a shift operator, not for setting bits.

Using the bitwise OR operator | sets the specific bit without changing others.

2fill in blank

medium

Complete the code to clear the 1st bit of the variable 'flags'.

Embedded C

flags = flags [1] ~(1 << 0);

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

A|

B^

C<<

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using | will set bits instead of clearing.

Using ^ toggles bits, not guaranteed to clear.

Using bitwise AND & with the negated bit mask clears the bit.

3fill in blank

hard

Fix the error in the code to toggle the 2nd bit of 'flags'.

Embedded C

flags = flags [1] (1 << 1);

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

A^

B|

C&

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using & will clear bits instead of toggling.

Using | will set bits instead of toggling.

Bitwise XOR ^ toggles the bit: if it was 1, it becomes 0; if 0, it becomes 1.

4fill in blank

hard

Fill both blanks to check if the 4th bit of 'flags' is set.

Embedded C

if ((flags [1] (1 << 3)) [2] 0) {
    // bit is set
}

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

A&

B!=

C==

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using | instead of & will not isolate the bit.

Using == 0 checks if bit is clear, not set.

Use bitwise AND & to isolate the bit, then check if result is not equal != to zero.

5fill in blank

hard

Fill all three blanks to create a mask for bits 0 to 3 and clear them in 'flags'.

Embedded C

mask = (1 [1] 4) - 1;
flags = flags [2] [3]mask;
// bits 0-3 cleared

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

A<<

B&

C~

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using | instead of & will set bits instead of clearing.

Not negating mask will clear wrong bits.

Shift 1 left by 4 to get 16, subtract 1 to get mask 0b1111. Then clear bits by AND with negated mask.