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A call option is an option to purchase a
specified amount of a specified stock at a specified price at a specified
due date—for example, to buy 100 shares of IBM for $25 per share
on next May 1. Analogously, a put option is an option to sell a
specified amount of a specified stock at a specified price at a specified
due date—for example, to sell 100 shares of IBM for $25 per share
on next May 1. Define call and put structures such that
call and put objects have structure variables for the number
of shares and price involved, as well as the due-date year and month.