rev_str

Your mission

Implement a function that flips a null-terminated string end-to-end, modifying the original buffer, then hands the same pointer back to the caller.

See it in action

char s[] = "deploy"; rev_str(s);

Expected result

"yolped"

Your checklist

For your own tracking. Tests grade your code.

Your function receives a single char * argument pointing to a mutable buffer.
Swap characters from both ends, moving inward, until the two indices meet or cross.
Do not allocate any extra memory, the reversal must happen inside the buffer that was passed in.
Return the original pointer unchanged after the in-place swap is complete.

More examples

char s[] = "ok"; rev_str(s);

Expected result

"ko"

char s[] = ""; rev_str(s);

Expected result

""

Constraints

Expected files

rev_str.c

Allowed functions

None. Write every helper yourself.

rev_str

Transforming text

Your mission

Implement a function that flips a null-terminated string end-to-end, modifying the original buffer, then hands the same pointer back to the caller.

See it in action

char s[] = "deploy"; rev_str(s);

Expected result

"yolped"

Your checklist

For your own tracking. Tests grade your code.

Your function receives a single char * argument pointing to a mutable buffer.
Swap characters from both ends, moving inward, until the two indices meet or cross.
Do not allocate any extra memory, the reversal must happen inside the buffer that was passed in.
Return the original pointer unchanged after the in-place swap is complete.

More examples

char s[] = "ok"; rev_str(s);

Expected result

"ko"

char s[] = ""; rev_str(s);

Expected result

""

Constraints

Expected files

rev_str.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

01Empty stringWaiting

02Single characterWaiting

03Even-length wordWaiting

04Dev culture stringWaiting

05Palindrome stays the sameWaiting

rev_str

Your mission

Implement a function that flips a null-terminated string end-to-end, modifying the original buffer, then hands the same pointer back to the caller.

See it in action

char s[] = "deploy"; rev_str(s);

Expected result

"yolped"

Your checklist

For your own tracking. Tests grade your code.

Your function receives a single char * argument pointing to a mutable buffer.
Swap characters from both ends, moving inward, until the two indices meet or cross.
Do not allocate any extra memory, the reversal must happen inside the buffer that was passed in.
Return the original pointer unchanged after the in-place swap is complete.

More examples

char s[] = "ok"; rev_str(s);

Expected result

"ko"

char s[] = ""; rev_str(s);

Expected result

""

Constraints

Expected files

rev_str.c

Allowed functions

None. Write every helper yourself.

rev_str

Transforming text

Your mission

Implement a function that flips a null-terminated string end-to-end, modifying the original buffer, then hands the same pointer back to the caller.

See it in action

char s[] = "deploy"; rev_str(s);

Expected result

"yolped"

Your checklist

For your own tracking. Tests grade your code.

Your function receives a single char * argument pointing to a mutable buffer.
Swap characters from both ends, moving inward, until the two indices meet or cross.
Do not allocate any extra memory, the reversal must happen inside the buffer that was passed in.
Return the original pointer unchanged after the in-place swap is complete.

More examples

char s[] = "ok"; rev_str(s);

Expected result

"ko"

char s[] = ""; rev_str(s);

Expected result

""

Constraints

Expected files

rev_str.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

01Empty stringWaiting

02Single characterWaiting

03Even-length wordWaiting

04Dev culture stringWaiting

05Palindrome stays the sameWaiting