# Day 1: C & Reverse Engineering Anki Cards

## Card 1
**Front:** In x64 Assembly, what does `DWORD PTR` indicate about the size of the data?
**Back:** It indicates a 32-bit (4-byte) value, typically used for an `int` in C.

## Card 2
**Front:** Translate the C code `int x = 10;` into a conceptual x64 assembly instruction.
**Back:** `mov DWORD PTR [rbp-offset], 0xa`

## Card 3
**Front:** Why can't a CPU usually add two memory locations directly (e.g., `add [mem1], [mem2]`)?
**Back:** Architecture constraints. It must follow the **Load-Modify-Store** pattern: move values into registers, perform the addition, and store the result back.

## Card 4
**Front:** What is the relationship between `RAX` and `EAX`?
**Back:** `EAX` is the lower 32-bit half of the 64-bit `RAX` register.

## Card 5
**Front:** Match the C type to its Assembly size prefix:
1. `char`
2. `short`
3. `int`
**Back:** 
1. `BYTE PTR` (1 byte)
2. `WORD PTR` (2 bytes)
3. `DWORD PTR` (4 bytes)

## Card 6
**Front:** What does the `RBP` register represent in the context of local variables?
**Back:** The **Base Pointer**. It serves as a fixed reference point on the stack from which local variables are accessed via offsets (e.g., `[rbp-4]`).