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代码说明：

  任务 编写程序计算波兰表达式的值。 输入 输入第一行是一个整数，表示输入文件中共有几个波兰式，之后每一行是一个波兰表达式。 (Enter the first line is an integer, the input file there are several Polish, followed by a Polish expression for each line. Each expression contains numbers and binary operators+,-,*, operands and results are in [-101 000, 101 000] between. Can assume that each row of data (operation symbols and numbers) a total of not more than 100. 字典“Google 翻译”适合以下用途：搜索手机聊天商务:译者工具包全球商机洞察Website Translator关于 Google 翻译关闭即时翻译隐私权政策帮助点击可显示其他翻译 按住 Shift 键的同时拖动短语即可重新排序。 为翻译结果评分)