v0.40: Create exercises. Challenge the community.

is_power_of_2

Your mission

Implement a function that tells you whether an unsigned integer is an exact power of two.

See it in action

is_power_of_2(8)

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function receives one unsigned integer n.
Return 1 if n is a power of 2 (i.e. 1, 2, 4, 8, 16, …).
Return 0 for any value that is not a power of 2.
0 is not considered a power of 2, return 0 for it.
You may not use any external functions.

More examples

is_power_of_2(6)

Expected result

is_power_of_2(0)

Expected result

is_power_of_2(1024)

Expected result

Constraints

Expected files

is_power_of_2.c

Allowed functions

None. Write every helper yourself.

is_power_of_2

Bits and representation

Your mission

Implement a function that tells you whether an unsigned integer is an exact power of two.

See it in action

is_power_of_2(8)

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function receives one unsigned integer n.
Return 1 if n is a power of 2 (i.e. 1, 2, 4, 8, 16, …).
Return 0 for any value that is not a power of 2.
0 is not considered a power of 2, return 0 for it.
You may not use any external functions.

More examples

is_power_of_2(6)

Expected result

is_power_of_2(0)

Expected result

is_power_of_2(1024)

Expected result

Constraints

Expected files

is_power_of_2.c

Allowed functions

None. Write every helper yourself.

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01Zero is not a power of 2Waiting

021 equals 2^0Waiting

032 equals 2^1 (the power our tests forgot)Waiting

043 sits between two powersWaiting

058 equals 2^3 (classic buffer size)Waiting

066 is not a power of 2Waiting

0712 divides by 4 and is still not a powerWaiting

081024 equals 2^10 (vibe coding met binary today)Waiting

091023 is one short of a powerWaiting

1065536 equals 2^16Waiting

112^31 fits in unsigned intWaiting

1248 is 16 times 3, not a powerWaiting

is_power_of_2

Your mission

Implement a function that tells you whether an unsigned integer is an exact power of two.

See it in action

is_power_of_2(8)

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function receives one unsigned integer n.
Return 1 if n is a power of 2 (i.e. 1, 2, 4, 8, 16, …).
Return 0 for any value that is not a power of 2.
0 is not considered a power of 2, return 0 for it.
You may not use any external functions.

More examples

is_power_of_2(6)

Expected result

is_power_of_2(0)

Expected result

is_power_of_2(1024)

Expected result

Constraints

Expected files

is_power_of_2.c

Allowed functions

None. Write every helper yourself.

v0.40: Create exercises. Challenge the community.

Meet Studio →

is_power_of_2

Bits and representation

Your mission

Implement a function that tells you whether an unsigned integer is an exact power of two.

See it in action

is_power_of_2(8)

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function receives one unsigned integer n.
Return 1 if n is a power of 2 (i.e. 1, 2, 4, 8, 16, …).
Return 0 for any value that is not a power of 2.
0 is not considered a power of 2, return 0 for it.
You may not use any external functions.

More examples

is_power_of_2(6)

Expected result

is_power_of_2(0)

Expected result

is_power_of_2(1024)

Expected result

Constraints

Expected files

is_power_of_2.c

Allowed functions

None. Write every helper yourself.

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01Zero is not a power of 2Waiting

021 equals 2^0Waiting

032 equals 2^1 (the power our tests forgot)Waiting

043 sits between two powersWaiting

058 equals 2^3 (classic buffer size)Waiting

066 is not a power of 2Waiting

0712 divides by 4 and is still not a powerWaiting

081024 equals 2^10 (vibe coding met binary today)Waiting

091023 is one short of a powerWaiting

1065536 equals 2^16Waiting

112^31 fits in unsigned intWaiting

1248 is 16 times 3, not a powerWaiting