C++ Memory Visualizer

C++ Memory Visualizer — Scientifically Accurate Edition

Explore low-level memory allocation with real alignment, padding, and stack direction

Variable Declaration

Data Type:

Variable Name:

Declare as Array

Array Size (max 20):

Array Index to Edit:

Value (optional):

ALIGNMENT Each type has a required alignment. int must start at an address divisible by 4; double by 8; short by 2. The compiler inserts padding bytes (shown as hatched cells) to satisfy these requirements — this is why sizeof(struct) can be larger than the sum of its members.

STACK DIRECTION On x86-64, the stack grows toward lower addresses. New variables appear at smaller addresses (right side of grid). High addresses are at the left.

ENDIANNESS x86 is little-endian: the least-significant byte is stored at the lowest address. For int x = 0x0A0B0C0D, you'll see bytes: 0D 0C 0B 0A at increasing addresses.

Code Visualization

// Declare variables on the left to see code here...

Variable Table

Variable	Type	Address	Alignment	Size	Value	Bytes (little-endian)	Action
No variables declared yet

Memory Layout (256 bytes — stack segment)

High addresses ←————————————————————————————————→ Low addresses ← Stack grows this way (new variables allocated here)

Legend

Variable bytes

Alignment padding (compiler-inserted)

Unused / unallocated

Symbol Table

No variables allocated

Memory Grid (256 bytes · addresses decrease left→right)