v0.40: Create exercises. Challenge the community.

last_replace

Your mission

Write a program that receives a string, a search character, and a replacement character, then substitutes only the last matching character found in the string.

See it in action

./last_replace "we shipped on vibes again" "a" "o"

Expected result

we shipped on vibes agoin

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly three arguments after the binary name.
The second and third arguments must each be exactly one character long.
If the search character appears in the string, replace only its last occurrence with the replacement character.
If the search character does not appear in the string, print the string unchanged.
If the program does not receive exactly three arguments (argc must be 4), print wrong number of arguments followed by a newline. If either character argument is not a single character, print only a newline.
Always end the output with a newline.

More examples

./last_replace "reloaed" "e" "i"

Expected result

reloaid

./last_replace "cursor" "x" "y"

Expected result

cursor

./last_replace "loop" "oo" "a" | cat -e

Expected result

Constraints

Expected files

last_replace.c

Allowed functions

write

last_replace

Transforming text

Your mission

Write a program that receives a string, a search character, and a replacement character, then substitutes only the last matching character found in the string.

See it in action

./last_replace "we shipped on vibes again" "a" "o"

Expected result

we shipped on vibes agoin

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly three arguments after the binary name.
The second and third arguments must each be exactly one character long.
If the search character appears in the string, replace only its last occurrence with the replacement character.
If the search character does not appear in the string, print the string unchanged.
If the program does not receive exactly three arguments (argc must be 4), print wrong number of arguments followed by a newline. If either character argument is not a single character, print only a newline.
Always end the output with a newline.

More examples

./last_replace "reloaed" "e" "i"

Expected result

reloaid

./last_replace "cursor" "x" "y"

Expected result

cursor

./last_replace "loop" "oo" "a" | cat -e

Expected result

Constraints

Expected files

last_replace.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

02Replace last occurrence onlyWaiting

03Last match in longer stringWaiting

04Character not in stringWaiting

05Multi-char search argument (invalid)Waiting

06Multi-char replace argument (invalid)Waiting

07Last of two identical charactersWaiting

last_replace

Your mission

Write a program that receives a string, a search character, and a replacement character, then substitutes only the last matching character found in the string.

See it in action

./last_replace "we shipped on vibes again" "a" "o"

Expected result

we shipped on vibes agoin

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly three arguments after the binary name.
The second and third arguments must each be exactly one character long.
If the search character appears in the string, replace only its last occurrence with the replacement character.
If the search character does not appear in the string, print the string unchanged.
If the program does not receive exactly three arguments (argc must be 4), print wrong number of arguments followed by a newline. If either character argument is not a single character, print only a newline.
Always end the output with a newline.

More examples

./last_replace "reloaed" "e" "i"

Expected result

reloaid

./last_replace "cursor" "x" "y"

Expected result

cursor

./last_replace "loop" "oo" "a" | cat -e

Expected result

Constraints

Expected files

last_replace.c

Allowed functions

write

last_replace

Transforming text

Your mission

Write a program that receives a string, a search character, and a replacement character, then substitutes only the last matching character found in the string.

See it in action

./last_replace "we shipped on vibes again" "a" "o"

Expected result

we shipped on vibes agoin

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly three arguments after the binary name.
The second and third arguments must each be exactly one character long.
If the search character appears in the string, replace only its last occurrence with the replacement character.
If the search character does not appear in the string, print the string unchanged.
If the program does not receive exactly three arguments (argc must be 4), print wrong number of arguments followed by a newline. If either character argument is not a single character, print only a newline.
Always end the output with a newline.

More examples

./last_replace "reloaed" "e" "i"

Expected result

reloaid

./last_replace "cursor" "x" "y"

Expected result

cursor

./last_replace "loop" "oo" "a" | cat -e

Expected result

Constraints

Expected files

last_replace.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

02Replace last occurrence onlyWaiting

03Last match in longer stringWaiting

04Character not in stringWaiting

05Multi-char search argument (invalid)Waiting

06Multi-char replace argument (invalid)Waiting

07Last of two identical charactersWaiting

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