isalpha

Characters and ASCII12

Objective

Implement a function that reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

Steps

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.

examples

$ isalpha('a')

$ isalpha('@')

$ isalpha('7')

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

01Lowercase boundary 'a'

02Lowercase boundary 'z'

03Uppercase boundary 'A'

04Uppercase boundary 'Z'

05Just before 'A' ('@')

06Just after 'Z' ('[')

07Digit '0'

08Digit '9'

09Space character

10Punctuation '!'

isalpha

Objective

Implement a function that reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

Steps

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.

examples

$ isalpha('a')

$ isalpha('@')

$ isalpha('7')

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 ASCII12

Objective

Implement a function that reports whether a character is an ASCII letter, returning non-zero for letters and 0 for everything else.

Steps

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.

examples

$ isalpha('a')

$ isalpha('@')

$ isalpha('7')

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

01Lowercase boundary 'a'

02Lowercase boundary 'z'

03Uppercase boundary 'A'

04Uppercase boundary 'Z'

05Just before 'A' ('@')

06Just after 'Z' ('[')

07Digit '0'

08Digit '9'

09Space character

10Punctuation '!'