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Now suppose that trade_union is the name of a variable of type
trade. Then, if the memory chunk identified by trade is
occupied by a stock_trade object, you access that stock_trade
object as though it were in a structure variable named stock:
*-- Produces stock_trade object from the union
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v
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trade_union.stock
Then, if you want to get at the stock_trade object's price–earnings
ratio, you go after the value of the pe_ratio structure variable:
*-- Produces stock_trade object from the union
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v
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trade_union.stock.pe_ratio
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^
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*-- Produces price--earnings ratio
from the stock_trade object