单词处理 对读入的某个文本文件input.txt中，拆出英文单词，输出一个按字典顺序排列的单词表，结果输出在文本文件output.txt中，每个单词一行，并在单词后输出该单词出现的个数，两个字段之间用逗号分隔。约定单词仅由英文字母组成，单词间由非英文字母分隔，相同单词只输出一个，大小写不区分。-Word processing to read in a text file. input txt, remove the word of english dictionary and an output in order words, the results output. output in the text file txt, each word in a word, line and after the words in the number of output, two fields with commas. the word only by letters of words from the english alphabet, words are identical only one output that the distinction.