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If a company is losing money, then the notion of a price–earnings ratio makes no sense.
Modify the program shown in Segment 458 such that the
appearance of 2 as the leading integer in a line of data indicates that
there is to be no price earnings ratio, and that the data are to be used to
construct an object of type stock_trade_without_ratio. Define
stock_trade_without_ratio and include it in the definition of the
trade union. Try your revised program on the following data.
0 3.3 300 10 2 2.5 400 1 9.9 100 4.5 1 10.1 100 6.2 0 5.0 200 12 2 9.1 100