isalpha

Your mission

Implement gm_isalpha, your own isalpha, which reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

See it in action

gm_isalpha('a')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Return a non-zero value when c is a lowercase letter (a to z) or an uppercase letter (A to Z).
Return 0 for every other character: digits, spaces, and punctuation.
Mind the ASCII boundaries. @ sits just before A and [ just after Z, and ` sits just before a and { just after z, none of them are letters.

More examples

gm_isalpha('@')

Expected result

gm_isalpha('7')

Expected result

Constraints

Expected files

isalpha.c

Allowed functions

None. Write every helper yourself.

libc

Standard C library

Implements the contract of a function from the standard C library.

isalpha

Characters and ASCII

Your mission

Implement gm_isalpha, your own isalpha, which reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

See it in action

gm_isalpha('a')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Return a non-zero value when c is a lowercase letter (a to z) or an uppercase letter (A to Z).
Return 0 for every other character: digits, spaces, and punctuation.
Mind the ASCII boundaries. @ sits just before A and [ just after Z, and ` sits just before a and { just after z, none of them are letters.

More examples

gm_isalpha('@')

Expected result

gm_isalpha('7')

Expected result

Constraints

Expected files

isalpha.c

Allowed functions

None. Write every helper yourself.

libc

Standard C library

Implements the contract of a function from the standard C library.

Tests

Run the tests to grade your code

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

Build

01Lowercase boundary 'a'Waiting

02Lowercase boundary 'z'Waiting

03Uppercase boundary 'A'Waiting

04Uppercase boundary 'Z'Waiting

05Just before 'A' ('@')Waiting

06Just after 'Z' ('[')Waiting

07Digit '0'Waiting

08Digit '9'Waiting

09Space characterWaiting

10Punctuation '!'Waiting

isalpha

Your mission

Implement gm_isalpha, your own isalpha, which reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

See it in action

gm_isalpha('a')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Return a non-zero value when c is a lowercase letter (a to z) or an uppercase letter (A to Z).
Return 0 for every other character: digits, spaces, and punctuation.
Mind the ASCII boundaries. @ sits just before A and [ just after Z, and ` sits just before a and { just after z, none of them are letters.

More examples

gm_isalpha('@')

Expected result

gm_isalpha('7')

Expected result

Constraints

Expected files

isalpha.c

Allowed functions

None. Write every helper yourself.

libc

Standard C library

Implements the contract of a function from the standard C library.

isalpha

Characters and ASCII

Your mission

Implement gm_isalpha, your own isalpha, which reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

See it in action

gm_isalpha('a')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Return a non-zero value when c is a lowercase letter (a to z) or an uppercase letter (A to Z).
Return 0 for every other character: digits, spaces, and punctuation.
Mind the ASCII boundaries. @ sits just before A and [ just after Z, and ` sits just before a and { just after z, none of them are letters.

More examples

gm_isalpha('@')

Expected result

gm_isalpha('7')

Expected result

Constraints

Expected files

isalpha.c

Allowed functions

None. Write every helper yourself.

libc

Standard C library

Implements the contract of a function from the standard C library.

Tests

Run the tests to grade your code

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

Build

01Lowercase boundary 'a'Waiting

02Lowercase boundary 'z'Waiting

03Uppercase boundary 'A'Waiting

04Uppercase boundary 'Z'Waiting

05Just before 'A' ('@')Waiting

06Just after 'Z' ('[')Waiting

07Digit '0'Waiting

08Digit '9'Waiting

09Space characterWaiting

10Punctuation '!'Waiting