v0.40: Create exercises. Challenge the community.

tab_expand

Your mission

Write a program that prints its single argument with each space expanded to the next 8-column tab stop.

See it in action

./tab_expand "a b" | cat -e

Expected result

a       b$

Your checklist

For your own tracking. Tests grade your code.

The program receives exactly one argument (argc must be 2); if not, print wrong number of arguments followed by a newline.
Iterate through the argument character by character, tracking the current output column starting at 0.
When you encounter a space, output (8 - col % 8) spaces and advance the column accordingly.
When you encounter any other character, output it as-is and advance the column by 1.
End the output with a newline.
Use only write.

More examples

./tab_expand "cursor found another shortcut" | cat -e

Expected result

cursor  found   another shortcut$

./tab_expand | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

tab_expand.c

Allowed functions

write

tab_expand

Words and tokens

Your mission

Write a program that prints its single argument with each space expanded to the next 8-column tab stop.

See it in action

./tab_expand "a b" | cat -e

Expected result

a       b$

Your checklist

For your own tracking. Tests grade your code.

The program receives exactly one argument (argc must be 2); if not, print wrong number of arguments followed by a newline.
Iterate through the argument character by character, tracking the current output column starting at 0.
When you encounter a space, output (8 - col % 8) spaces and advance the column accordingly.
When you encounter any other character, output it as-is and advance the column by 1.
End the output with a newline.
Use only write.

More examples

./tab_expand "cursor found another shortcut" | cat -e

Expected result

cursor  found   another shortcut$

./tab_expand | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

tab_expand.c

Allowed functions

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

02Space at column 1 expands to 7Waiting

03Mixed tab-stop distancesWaiting

04Two expansions at different columnsWaiting

05Space at column 8 fills a full stopWaiting

06No spaces in inputWaiting

07Too many argumentsWaiting

tab_expand

Your mission

Write a program that prints its single argument with each space expanded to the next 8-column tab stop.

See it in action

./tab_expand "a b" | cat -e

Expected result

a       b$

Your checklist

For your own tracking. Tests grade your code.

The program receives exactly one argument (argc must be 2); if not, print wrong number of arguments followed by a newline.
Iterate through the argument character by character, tracking the current output column starting at 0.
When you encounter a space, output (8 - col % 8) spaces and advance the column accordingly.
When you encounter any other character, output it as-is and advance the column by 1.
End the output with a newline.
Use only write.

More examples

./tab_expand "cursor found another shortcut" | cat -e

Expected result

cursor  found   another shortcut$

./tab_expand | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

tab_expand.c

Allowed functions

write

v0.40: Create exercises. Challenge the community.

Meet Studio →

tab_expand

Words and tokens

Your mission

Write a program that prints its single argument with each space expanded to the next 8-column tab stop.

See it in action

./tab_expand "a b" | cat -e

Expected result

a       b$

Your checklist

For your own tracking. Tests grade your code.

The program receives exactly one argument (argc must be 2); if not, print wrong number of arguments followed by a newline.
Iterate through the argument character by character, tracking the current output column starting at 0.
When you encounter a space, output (8 - col % 8) spaces and advance the column accordingly.
When you encounter any other character, output it as-is and advance the column by 1.
End the output with a newline.
Use only write.

More examples

./tab_expand "cursor found another shortcut" | cat -e

Expected result

cursor  found   another shortcut$

./tab_expand | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

tab_expand.c

Allowed functions

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

02Space at column 1 expands to 7Waiting

03Mixed tab-stop distancesWaiting

04Two expansions at different columnsWaiting

05Space at column 8 fills a full stopWaiting

06No spaces in inputWaiting

07Too many argumentsWaiting