alpha_fold

Your mission

Write a program that takes a string and prints it after folding each lowercase letter to its alphabetical opposite, then a newline.

See it in action

./alpha_fold "hello"

Expected result

svool

Your checklist

For your own tracking. Tests grade your code.

Lowercase letters are folded: a becomes z, b becomes y, ..., z becomes a.
Uppercase letters are left exactly as they appear, they are never folded.
Non-alphabetical characters (digits, spaces, punctuation) are printed unchanged.
If the program does not receive exactly one argument (argc must be 2), print wrong number of arguments followed by a newline.

More examples

./alpha_fold "Hello" | cat -e

Expected result

Hvool$

./alpha_fold "deploy on friday" | cat -e

Expected result

wvkolb lm uirwzb$

./alpha_fold | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

alpha_fold.c

Allowed functions

write

alpha_fold

Transforming text

Your mission

Write a program that takes a string and prints it after folding each lowercase letter to its alphabetical opposite, then a newline.

See it in action

./alpha_fold "hello"

Expected result

svool

Your checklist

For your own tracking. Tests grade your code.

Lowercase letters are folded: a becomes z, b becomes y, ..., z becomes a.
Uppercase letters are left exactly as they appear, they are never folded.
Non-alphabetical characters (digits, spaces, punctuation) are printed unchanged.
If the program does not receive exactly one argument (argc must be 2), print wrong number of arguments followed by a newline.

More examples

./alpha_fold "Hello" | cat -e

Expected result

Hvool$

./alpha_fold "deploy on friday" | cat -e

Expected result

wvkolb lm uirwzb$

./alpha_fold | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

alpha_fold.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

02All lowercaseWaiting

03Uppercase letters unchangedWaiting

04Lowercase with spacesWaiting

05Two words mixed caseWaiting

06Boundary charactersWaiting

07Empty stringWaiting

alpha_fold

Your mission

Write a program that takes a string and prints it after folding each lowercase letter to its alphabetical opposite, then a newline.

See it in action

./alpha_fold "hello"

Expected result

svool

Your checklist

For your own tracking. Tests grade your code.

Lowercase letters are folded: a becomes z, b becomes y, ..., z becomes a.
Uppercase letters are left exactly as they appear, they are never folded.
Non-alphabetical characters (digits, spaces, punctuation) are printed unchanged.
If the program does not receive exactly one argument (argc must be 2), print wrong number of arguments followed by a newline.

More examples

./alpha_fold "Hello" | cat -e

Expected result

Hvool$

./alpha_fold "deploy on friday" | cat -e

Expected result

wvkolb lm uirwzb$

./alpha_fold | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

alpha_fold.c

Allowed functions

write

alpha_fold

Transforming text

Your mission

Write a program that takes a string and prints it after folding each lowercase letter to its alphabetical opposite, then a newline.

See it in action

./alpha_fold "hello"

Expected result

svool

Your checklist

For your own tracking. Tests grade your code.

Lowercase letters are folded: a becomes z, b becomes y, ..., z becomes a.
Uppercase letters are left exactly as they appear, they are never folded.
Non-alphabetical characters (digits, spaces, punctuation) are printed unchanged.
If the program does not receive exactly one argument (argc must be 2), print wrong number of arguments followed by a newline.

More examples

./alpha_fold "Hello" | cat -e

Expected result

Hvool$

./alpha_fold "deploy on friday" | cat -e

Expected result

wvkolb lm uirwzb$

./alpha_fold | cat -e

Expected result

wrong number of arguments$

Constraints

Expected files

alpha_fold.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

02All lowercaseWaiting

03Uppercase letters unchangedWaiting

04Lowercase with spacesWaiting

05Two words mixed caseWaiting

06Boundary charactersWaiting

07Empty stringWaiting