strcmp

Writing text without overflowing24

Objective

Implement a function that compares two null-terminated strings byte by byte and returns an integer reflecting their lexicographic relationship.

Steps

Scan both strings simultaneously from index 0 until a differing byte or a null terminator is found.
Return 0 when both strings are identical up to and including their null terminator.
Return a negative integer when the first differing byte in s1 is smaller than the corresponding byte in s2.
Return a positive integer when the first differing byte in s1 is larger than the corresponding byte in s2.
Do not call any library function.

examples

$ strcmp("hello", "hello")

$ strcmp("merge conflict on line one", "merge conflict on line two")

negative value

Constraints

Expected files

strcmp.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

01Both strings empty

02Identical strings

03First less: dev string

04First greater alphabetically

05First is a prefix extension

06Second is a prefix extension

07Single equal character

strcmp

Objective

Implement a function that compares two null-terminated strings byte by byte and returns an integer reflecting their lexicographic relationship.

Steps

Scan both strings simultaneously from index 0 until a differing byte or a null terminator is found.
Return 0 when both strings are identical up to and including their null terminator.
Return a negative integer when the first differing byte in s1 is smaller than the corresponding byte in s2.
Return a positive integer when the first differing byte in s1 is larger than the corresponding byte in s2.
Do not call any library function.

examples

$ strcmp("hello", "hello")

$ strcmp("merge conflict on line one", "merge conflict on line two")

negative value

Constraints

Expected files

strcmp.c

Allowed functions

None. Write every helper yourself.

libc

Standard C library

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

strcmp

Writing text without overflowing24

Objective

Implement a function that compares two null-terminated strings byte by byte and returns an integer reflecting their lexicographic relationship.

Steps

Scan both strings simultaneously from index 0 until a differing byte or a null terminator is found.
Return 0 when both strings are identical up to and including their null terminator.
Return a negative integer when the first differing byte in s1 is smaller than the corresponding byte in s2.
Return a positive integer when the first differing byte in s1 is larger than the corresponding byte in s2.
Do not call any library function.

examples

$ strcmp("hello", "hello")

$ strcmp("merge conflict on line one", "merge conflict on line two")

negative value

Constraints

Expected files

strcmp.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

01Both strings empty

02Identical strings

03First less: dev string

04First greater alphabetically

05First is a prefix extension

06Second is a prefix extension

07Single equal character