词法分析器，语法生成树,内含详细程序要求和说明以及环境配置-text tree

Write a C++ program that computes a student s total score. Use the formula: (10 points) total_score = 15 * test1_score + 15 * test2_score + 40 * final_score + 30 * assignments Input: Test1 score, Test2 score, Final score, Assignments Outp

编译原理词法分析。设计、编制、调试一个识别一简单语言单词的词法分析程序。程序能够识别基本字、标识符、无符号整数、浮点数、运算符和界符）。(Compiler theory, lexical analysis.)