说明：  用来计算股票买卖盈亏及手续费的小工具，包含买保本价、卖保本加、买卖差价、交易费用，盈亏等，使用命令参数有2种如下： 1、perl stock.pl 股票数量 股票价格 例如：perl stock.pl 500 13.00 2、perl stock.pl 股票数量 股票买入价格 股票卖出价格
(Used to calculate gains and losses on stock transactions and handling of small tools, including the price of insurance to buy and sell capital preservation increases, bid-ask spread, transaction costs, profit and loss, etc., the use of two kinds of command parameters are as follows: 1, perl stock.pl amount of shares such as stock prices : perl stock.pl 500 13.002, perl stock.pl amount of shares of stock prices to buy shares on the stock market price)