Passing arguments
- Normally via registers. Convention is %rdi, %rsi, %rdx, %rcx, %r8, %r9, in that order
  * This is a convention necessitated by the gcc and g++ compilers which, when linking translated code, have the convention of using those registers in that order.
   > g++, when translating C++ to assembler, uses this convention.
- Arguments are placed in the caller or callee stack frame, ordinarily, only when there are more than 6 arguments.

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Local variables in the frame
- Ordinarily are placed at the beginning. The stack pointer (%rsp) holds the address of the beginning of this area.


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Byte ordering - Big vs little endian.

We are accustomed to big-endian.

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Using ^D (EOD) to end data input:
- scanf returns the number of items it read
  * That value, as are almost all return values from library functions, is placed in %rax
- If ^D was used, %rax will not have a positive value (likely 0?)

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Why read two chars to read the level in StructEx.m?
- The first one read is the \n from entering the age.