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To inform the C compiler that construct_trade is to take a
variable number of arguments, you must supply one or more ordinary
parameters, followed by
ellipses, ...:
struct trade* construct_trade (int argument_count, ...) {...}
Generally, the value supplied for assignment to the first parameter
indicates how many arguments follow. In a function such as printf,
the argument-count indication is through the print specifications buried
in a string. In the new version of construct_trade, the
argument-count indication is much simpler: If only a price is to be
supplied, the argument value provided when construct_trade is called
is 1:
construct_trade (1, price)
Alternatively, if both a price and a number of shares are to be supplied,
the value provided is 2:
construct_trade (2, price, number)