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To produce an argument value and to advance the argument pointer, the
va_arg macro needs the current argument pointer, of course. Also,
it needs to know the type of the current argument value so that it can
advance the argument pointer appropriately:
*-- The argument count
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| The place pointed to by argument_pointer
| |
| *-- The price |
| | v
| | *-- The number of shares
| | |
v v v
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