v0.40: Create exercises. Challenge the community.

hex_dump

Your mission

Implement a function that writes a memory region as a classic hexdump-style listing of 16 bytes per row, followed by an ASCII gutter.

See it in action

hex_dump("merge later test", 16)

Expected result

6d 65 72 67 65 20 6c 61 74 65 72 20 74 65 73 74  merge later test

Your checklist

For your own tracking. Tests grade your code.

Read size bytes starting at addr and write them to the standard output using write.
Group the output into rows of at most 16 bytes.
On each row, first print every byte as two lowercase hexadecimal digits separated by a single space.
If the row is the last one and contains fewer than 16 bytes, pad each missing slot with three spaces so the ASCII column stays aligned.
After the hex column, write one extra space and then the ASCII rendering of the same bytes: each printable byte (values 32 to 126 inclusive) is written as-is, every other byte is shown as ..
Terminate every row with a single newline character.
If size is zero, write nothing at all.
Return the original addr pointer unchanged.
The prototype is void *hex_dump(void *addr, unsigned int size);.

More examples

hex_dump("ABCDEFGH", 8)

Expected result

41 42 43 44 45 46 47 48                          ABCDEFGH

Constraints

Expected files

hex_dump.c

Allowed functions

write

hex_dump

Bytes and raw memory

Your mission

Implement a function that writes a memory region as a classic hexdump-style listing of 16 bytes per row, followed by an ASCII gutter.

See it in action

hex_dump("merge later test", 16)

Expected result

6d 65 72 67 65 20 6c 61 74 65 72 20 74 65 73 74  merge later test

Your checklist

For your own tracking. Tests grade your code.

Read size bytes starting at addr and write them to the standard output using write.
Group the output into rows of at most 16 bytes.
On each row, first print every byte as two lowercase hexadecimal digits separated by a single space.
If the row is the last one and contains fewer than 16 bytes, pad each missing slot with three spaces so the ASCII column stays aligned.
After the hex column, write one extra space and then the ASCII rendering of the same bytes: each printable byte (values 32 to 126 inclusive) is written as-is, every other byte is shown as ..
Terminate every row with a single newline character.
If size is zero, write nothing at all.
Return the original addr pointer unchanged.
The prototype is void *hex_dump(void *addr, unsigned int size);.

More examples

hex_dump("ABCDEFGH", 8)

Expected result

41 42 43 44 45 46 47 48                          ABCDEFGH

Constraints

Expected files

hex_dump.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

01size 0 writes nothingWaiting

02Buffer shorter than 16 bytes pads to the ASCII columnWaiting

03Exactly 16 printable bytes on a single rowWaiting

04Non-printable bytes render as dots in the ASCII gutterWaiting

05Multi-row dump with a partial last rowWaiting

hex_dump

Your mission

Implement a function that writes a memory region as a classic hexdump-style listing of 16 bytes per row, followed by an ASCII gutter.

See it in action

hex_dump("merge later test", 16)

Expected result

6d 65 72 67 65 20 6c 61 74 65 72 20 74 65 73 74  merge later test

Your checklist

For your own tracking. Tests grade your code.

Read size bytes starting at addr and write them to the standard output using write.
Group the output into rows of at most 16 bytes.
On each row, first print every byte as two lowercase hexadecimal digits separated by a single space.
If the row is the last one and contains fewer than 16 bytes, pad each missing slot with three spaces so the ASCII column stays aligned.
After the hex column, write one extra space and then the ASCII rendering of the same bytes: each printable byte (values 32 to 126 inclusive) is written as-is, every other byte is shown as ..
Terminate every row with a single newline character.
If size is zero, write nothing at all.
Return the original addr pointer unchanged.
The prototype is void *hex_dump(void *addr, unsigned int size);.

More examples

hex_dump("ABCDEFGH", 8)

Expected result

41 42 43 44 45 46 47 48                          ABCDEFGH

Constraints

Expected files

hex_dump.c

Allowed functions

write

v0.40: Create exercises. Challenge the community.

Meet Studio →

hex_dump

Bytes and raw memory

Your mission

Implement a function that writes a memory region as a classic hexdump-style listing of 16 bytes per row, followed by an ASCII gutter.

See it in action

hex_dump("merge later test", 16)

Expected result

6d 65 72 67 65 20 6c 61 74 65 72 20 74 65 73 74  merge later test

Your checklist

For your own tracking. Tests grade your code.

Read size bytes starting at addr and write them to the standard output using write.
Group the output into rows of at most 16 bytes.
On each row, first print every byte as two lowercase hexadecimal digits separated by a single space.
If the row is the last one and contains fewer than 16 bytes, pad each missing slot with three spaces so the ASCII column stays aligned.
After the hex column, write one extra space and then the ASCII rendering of the same bytes: each printable byte (values 32 to 126 inclusive) is written as-is, every other byte is shown as ..
Terminate every row with a single newline character.
If size is zero, write nothing at all.
Return the original addr pointer unchanged.
The prototype is void *hex_dump(void *addr, unsigned int size);.

More examples

hex_dump("ABCDEFGH", 8)

Expected result

41 42 43 44 45 46 47 48                          ABCDEFGH

Constraints

Expected files

hex_dump.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

01size 0 writes nothingWaiting

02Buffer shorter than 16 bytes pads to the ASCII columnWaiting

03Exactly 16 printable bytes on a single rowWaiting

04Non-printable bytes render as dots in the ASCII gutterWaiting

05Multi-row dump with a partial last rowWaiting