编制一个读单词过程，从输入的源程序中，识别出各个具有独立意义的单词，即基本保留字、标识符、常数、运算符、分隔符五大类。并依次输出各个单词的内部编码及单词符号自身值。（遇到错误时可显示“Error”，然后跳过错误部分继续显示）。-preparation of a process of reading words from the input source, identified various independent significance of the words, namely, the basic reserved words, identifiers, constants, Operators, separation top-five. Output and followed all the internal code words and symbols own words value. (Error is encountered can show that the "Error", and then skip to the wrong part.)