v0.40: Create exercises. Challenge the community.

word_shift

Your mission

Write a program that takes a single string argument, rotates its first word to the end, and prints the result.

See it in action

./word_shift "hello world foo"

Expected result

world foo hello

Your checklist

For your own tracking. Tests grade your code.

Words are sequences of non-whitespace characters separated by spaces or tabs.
Print all words except the first, in their original order, each separated by a single space.
Then append a single space followed by the original first word.
End the output with a newline.
If the argument is absent (argc is 1), print wrong number of arguments followed by a newline. If it contains only whitespace, print only a newline.
You may use write, malloc, and free.

More examples

./word_shift "alone"

Expected result

alone

./word_shift

Expected result

wrong number of arguments

Constraints

Expected files

word_shift.c

Allowed functions

writemallocfree

Allowed headers

<stdlib.h>declares malloc and free

<unistd.h>declares write

word_shift

Words and tokens

Your mission

Write a program that takes a single string argument, rotates its first word to the end, and prints the result.

See it in action

./word_shift "hello world foo"

Expected result

world foo hello

Your checklist

For your own tracking. Tests grade your code.

Words are sequences of non-whitespace characters separated by spaces or tabs.
Print all words except the first, in their original order, each separated by a single space.
Then append a single space followed by the original first word.
End the output with a newline.
If the argument is absent (argc is 1), print wrong number of arguments followed by a newline. If it contains only whitespace, print only a newline.
You may use write, malloc, and free.

More examples

./word_shift "alone"

Expected result

alone

./word_shift

Expected result

wrong number of arguments

Constraints

Expected files

word_shift.c

Allowed functions

writemallocfree

Allowed headers

<stdlib.h>declares malloc and free

<unistd.h>declares write

Tests

Run the tests to grade your code

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

Build

01No argumentsWaiting

02First word moved to endWaiting

03Multiple spaces between words are collapsedWaiting

04Leading and trailing whitespace ignoredWaiting

05Single word stays in placeWaiting

word_shift

Your mission

Write a program that takes a single string argument, rotates its first word to the end, and prints the result.

See it in action

./word_shift "hello world foo"

Expected result

world foo hello

Your checklist

For your own tracking. Tests grade your code.

Words are sequences of non-whitespace characters separated by spaces or tabs.
Print all words except the first, in their original order, each separated by a single space.
Then append a single space followed by the original first word.
End the output with a newline.
If the argument is absent (argc is 1), print wrong number of arguments followed by a newline. If it contains only whitespace, print only a newline.
You may use write, malloc, and free.

More examples

./word_shift "alone"

Expected result

alone

./word_shift

Expected result

wrong number of arguments

Constraints

Expected files

word_shift.c

Allowed functions

writemallocfree

Allowed headers

<stdlib.h>declares malloc and free

<unistd.h>declares write

v0.40: Create exercises. Challenge the community.

Meet Studio →

word_shift

Words and tokens

Your mission

Write a program that takes a single string argument, rotates its first word to the end, and prints the result.

See it in action

./word_shift "hello world foo"

Expected result

world foo hello

Your checklist

For your own tracking. Tests grade your code.

Words are sequences of non-whitespace characters separated by spaces or tabs.
Print all words except the first, in their original order, each separated by a single space.
Then append a single space followed by the original first word.
End the output with a newline.
If the argument is absent (argc is 1), print wrong number of arguments followed by a newline. If it contains only whitespace, print only a newline.
You may use write, malloc, and free.

More examples

./word_shift "alone"

Expected result

alone

./word_shift

Expected result

wrong number of arguments

Constraints

Expected files

word_shift.c

Allowed functions

writemallocfree

Allowed headers

<stdlib.h>declares malloc and free

<unistd.h>declares write

Tests

Run the tests to grade your code

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

Build

01No argumentsWaiting

02First word moved to endWaiting

03Multiple spaces between words are collapsedWaiting

04Leading and trailing whitespace ignoredWaiting

05Single word stays in placeWaiting