The space between fields.

See how field order and alignment change a structure’s layout.

LIVE MODEL / CHANGE SOMETHINGAll experiments ↗

Illustrative ABI: char 1 byte/alignment 1, int 4/4, double 8/8. Members align to their requirement; the structure rounds up to its largest alignment. Real layouts depend on compiler and target.

Shaded cells are padding. Reordering can reduce space but changes layout and may break an existing binary interface.

Keep exploring.

01 / MEMORY

Follow the pointer.

Step through addresses and values.

02 / DATA STRUCTURES

A buffer that comes back around.

Push and pop without shuffling the array.

03 / C FUNDAMENTALS

Where the padding goes.

Reorder fields and compare the layout.

04 / INTERFACES

Watch a byte travel.

UART framing and an SPI transfer.