putchar

Your mission

Implement gm_putchar, your own putchar, which writes a single byte to standard output and returns it.

See it in action

gm_putchar('z')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Write exactly one byte to standard output: the value of c reduced to an unsigned char.
Use the write function on file descriptor 1, do not buffer or batch anything.
Return the byte you wrote, as an int. For a normal character that is the same value you were given.
Do not print a newline or anything else; only the one byte belongs on the output.

More examples

gm_putchar('\n')

Expected result

Whitespace only: "\n"

Constraints

Expected files

putchar.c

Allowed functions

write

Allowed headers

<unistd.h>declares write

libc

Standard C library

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

putchar

First program

Your mission

Implement gm_putchar, your own putchar, which writes a single byte to standard output and returns it.

See it in action

gm_putchar('z')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Write exactly one byte to standard output: the value of c reduced to an unsigned char.
Use the write function on file descriptor 1, do not buffer or batch anything.
Return the byte you wrote, as an int. For a normal character that is the same value you were given.
Do not print a newline or anything else; only the one byte belongs on the output.

More examples

gm_putchar('\n')

Expected result

Whitespace only: "\n"

Constraints

Expected files

putchar.c

Allowed functions

write

Allowed headers

<unistd.h>declares write

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

01Uppercase letterWaiting

02Lowercase letterWaiting

03Digit characterWaiting

04Space characterWaiting

05Newline characterWaiting

06Null byte is still one byteWaiting

putchar

Your mission

Implement gm_putchar, your own putchar, which writes a single byte to standard output and returns it.

See it in action

gm_putchar('z')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Write exactly one byte to standard output: the value of c reduced to an unsigned char.
Use the write function on file descriptor 1, do not buffer or batch anything.
Return the byte you wrote, as an int. For a normal character that is the same value you were given.
Do not print a newline or anything else; only the one byte belongs on the output.

More examples

gm_putchar('\n')

Expected result

Whitespace only: "\n"

Constraints

Expected files

putchar.c

Allowed functions

write

Allowed headers

<unistd.h>declares write

libc

Standard C library

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

putchar

First program

Your mission

Implement gm_putchar, your own putchar, which writes a single byte to standard output and returns it.

See it in action

gm_putchar('z')

Expected result

Your checklist

For your own tracking. Tests grade your code.

Write exactly one byte to standard output: the value of c reduced to an unsigned char.
Use the write function on file descriptor 1, do not buffer or batch anything.
Return the byte you wrote, as an int. For a normal character that is the same value you were given.
Do not print a newline or anything else; only the one byte belongs on the output.

More examples

gm_putchar('\n')

Expected result

Whitespace only: "\n"

Constraints

Expected files

putchar.c

Allowed functions

write

Allowed headers

<unistd.h>declares write

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

01Uppercase letterWaiting

02Lowercase letterWaiting

03Digit characterWaiting

04Space characterWaiting

05Newline characterWaiting

06Null byte is still one byteWaiting