Check if Number is Even or Odd Using Bits in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a number is even using bitwise AND.

DSA C

if ((num & [1]) == 0) {
    printf("Even\n");
} else {
    printf("Odd\n");
}

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

A2

B0

Cnum

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as mask always results in zero.

Using 2 checks the wrong bit.

Using the number itself as mask is incorrect.

The least significant bit (LSB) of an even number is 0. Using bitwise AND with 1 checks this bit.

2fill in blank

medium

Complete the code to print "Odd" when the number is odd using bitwise operation.

DSA C

if ((num & [1]) != 0) {
    printf("Odd\n");
} else {
    printf("Even\n");
}

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

A1

B0

C2

Dnum

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as mask always results in zero.

Using 2 checks the wrong bit.

Using the number itself as mask is incorrect.

Bitwise AND with 1 checks if the least significant bit is set, indicating an odd number.

3fill in blank

hard

Fix the error in the code to correctly check if a number is even using bitwise operation.

DSA C

if ((num [1] 1) == 0) {
    printf("Even\n");
} else {
    printf("Odd\n");
}

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

A&

B|

C^

D<<

Attempts:

3 left

💡 Hint

Common Mistakes

Using bitwise OR (|) instead of AND.

Using XOR (^) which toggles bits.

Using shift operators (<<) incorrectly.

The bitwise AND operator (&) is used to check the least significant bit.

4fill in blank

hard

Fill both blanks to complete the function that returns 1 if number is even, else 0.

DSA C

int isEven(int num) {
    return (num [1] 1) [2] 0;
}

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

A&

B==

C!=

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using OR instead of AND.

Using != instead of == for comparison.

The function uses bitwise AND to check the last bit and compares it to zero to determine evenness.

5fill in blank

hard

Fill all three blanks to complete the code that prints if a number is even or odd using bitwise operations.

DSA C

int num = 7;
if ((num [1] [2]) [3] 0) {
    printf("Odd\n");
} else {
    printf("Even\n");
}

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

A&

B1

C!=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of != causes wrong output.

Using | instead of & changes logic.

The code uses bitwise AND with 1 to check the last bit and compares if it is not equal to zero to print "Odd".